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                          REGISTRATION RIGHTS AGREEMENT
                              Dated April 27, 1998
                                    between
                              ICG SERVICES, INC.
                                     and
                       ▇▇▇▇▇▇ ▇▇▇▇▇▇▇ & CO. INCORPORATED
          -----------------------------------------------------------------
     
                            REGISTRATION RIGHTS AGREEMENT
                    THIS REGISTRATION RIGHTS AGREEMENT (the "Agreement") is
          made and entered into April 27, 1998, between ICG SERVICES, INC.,
          a Delaware corporation (the "Company"), and ▇▇▇▇▇▇ ▇▇▇▇▇▇▇ & CO.
          INCORPORATED (the "Placement Agent").
                    This Agreement is made pursuant to the Placement
          Agreement dated April 22,  1998, among the Company, NETCOM On-
          Line Communication Services, Inc. and the Placement Agent (the
          "Placement Agreement"), which provides for the sale by the
          Company to the Placement Agent of an aggregate of $405,250,000
          principal amount at maturity of the Company's 9 7/8% Senior
          Discount Notes due 2008 (the "Securities").  In order to induce
          the Placement Agent to enter into the Placement Agreement, the
          Company has agreed to provide to the Placement Agent and its
          direct and indirect transferees the registration rights set forth
          in this Agreement.  The execution of this Agreement is a
          condition to the closing under the Placement Agreement.
                    In consideration of the foregoing, the parties hereto
          agree as follows:
                    1.   Definitions.
                         -----------
                    As used in this Agreement, the following capitalized
          defined terms shall have the following meanings:
                    "1933 Act"
                    ---------
                     shall mean the Securities Act of 1933, as amended from 
          time to time.
                    "1934 Act"
                    ---------
                     shall mean the Securities Exchange Act of 1934, as
          amended from time to time.
                    "Accreted Value"
                    ----------------
                     shall have the meaning set forth in the Indenture.      
          
                    "Closing Date"
                    -------------
                     shall mean the Closing Date as defined in the
          Placement Agreement.
                    "Company"
                    ---------
                     shall have the meaning set forth in the preamble to 
          this Agreement and shall also include the Company's
          successors.
                    "Exchange Offer" 
                     --------------
                    shall mean the exchange offer by the Company of
          Exchange Securities for Registrable Securities pursuant to
          Section 2(a) hereof.
                    "Exchange Offer Registration" 
                     ---------------------------
                    shall mean a registration under the 1933 Act effected
          pursuant to Section 2(a) hereof.
                    "Exchange Offer Registration Statement" 
                     -------------------------------------
                    shall mean an exchange offer registration statement on
          Form S-4 (or, if applicable, on another appropriate form) and all
          amendments and supplements to such registration statement, in
          each case including the Prospectus contained therein, all
          exhibits thereto and all material incorporated by reference
          therein.
                    "Exchange Securities" 
                     -------------------
                    shall mean securities issued by the Company under the
          Indenture containing terms identical to the Securities (except
          that (i) interest thereon shall accrue from the last date on
          which interest was paid on the Securities or, if no such interest
          has been paid, from May 1, 2003 and (ii) the Exchange Securities
          will not provide for an increase in the rate of interest and will
          not contain terms with respect to transfer restrictions) and to
          be offered to Holders of Securities in exchange for Securities
          pursuant to the Exchange Offer.
                    "Holder" 
                     ------
                    shall mean the Placement Agent, for so long as it owns
          any Registrable Securities, and each of its successors, assigns
          and direct and indirect transferees who become registered owners
          of Registrable Securities under the Indenture; provided 
                                                         --------
          that, for purposes of Sections 4 and 5 of this Agreement, the
          term "Holder" shall include Participating Broker-Dealers (as
          defined in Section 4(a)).
                    "Indenture" 
                     ---------
                    shall mean the Indenture relating to the Securities to
          be dated as of the Closing Date between the Company and Norwest
          Bank Colorado, National Association, trustee, and as the same may
          be amended from time to time in accordance with the terms
          thereof.
                    "Majority Holders" 
                     ----------------
                    shall mean the Holders of a majority of the aggregate
          principal amount of outstanding Registrable Securities; provided 
                                                                  --------
          that, whenever the consent or approval of Holders of a specified
          percentage of Registrable Securities is required hereunder,
          Registrable Securities held by the Company or any of its
          affiliates (as such term is defined in Rule 405 under the ▇▇▇▇
          ▇▇▇) (other than the Placement Agent or subsequent holders of
          Registrable Securities if such subsequent holders are deemed to
          be such affiliates solely by reason of their holding of such
          Registrable Securities) shall not be counted in determining
          whether such consent or approval was given by the Holders of such
          required percentage or amount.
                    "Person" 
                     ------
                    shall mean an individual, partnership, corporation,
          trust or unincorporated organization, or a government or agency
          or political subdivision thereof.
                    "Placement Agent" 
                     ---------------
                    shall have the meaning set forth in the preamble to
          this Agreement.
                    "Placement Agreement" 
                     -------------------
                    shall have the meaning set forth in the preamble.
                    "Prospectus" 
                     ----------
                    shall mean the prospectus included in a Registration
          Statement, including any preliminary prospectus, and any such
          prospectus as amended or supplemented by any prospectus
          supplement, including a prospectus supplement with respect to the
          terms of the offering of any portion of the Registrable
          Securities covered by a Shelf Registration Statement, and by all
          other amendments and supplements to such prospectus, and in each
          case including all material incorporated by reference therein.
                    "Registrable Securities" 
                     ----------------------
                    shall mean the Securities; provided, however, that the
                                               -------  --------
          Securities shall cease to be Registrable Securities (i) when a
          Registration Statement with respect to such Securities shall have
          been declared effective under the 1933 Act and such Securities shall
          have been disposed of pursuant to such Registration Statement,
          (ii) when such Securities have been sold to the public pursuant
          to Rule 144(k) (or any similar provision then in force, but not
          Rule 144A) under the 1933 Act or (iii) when such Securities shall
          have ceased to be outstanding.
                    "Registration Expenses" 
                     ---------------------
          shall mean any and all expenses incident to performance of or
          compliance by the Company with this Agreement, including without
          limitation:  (i) all SEC, stock exchange or National Association
          of Securities Dealers, Inc. registration and filing fees, (ii)
          all fees and expenses incurred in connection with compliance with
          state securities or blue sky laws (including reasonable fees and
          disbursements of counsel for any underwriters or Holders in
          connection with blue sky qualification of any of the Exchange
          Securities or Registrable Securities), (iii) all expenses of any
          Persons in preparing or assisting in preparing, word processing,
          printing and distributing any Registration Statement, any
          Prospectus, any amendments or supplements thereto, any
          underwriting agreements, securities sales agreements and other
          documents relating to the performance of and compliance with this
          Agreement, (iv) all rating agency fees, (v) all fees and
          disbursements relating to the qualification of the Indenture
          under applicable securities laws, (vi) the fees and disbursements
          of the Trustee and its counsel, (vii) the fees and disbursements
          of counsel for the Company and, in the case of a Shelf
          Registration Statement, the fees and disbursements of one counsel
          for the Holders (which counsel shall be selected by the Majority
          Holders and which counsel may also be counsel for the Placement
          Agent) and (viii) the fees and disbursements of the independent
          public accountants of the Company, including the expenses of any
          special audits or "cold comfort" letters required by or incident
          to such performance and compliance, but excluding fees and
          expenses of counsel to the underwriters (other than fees and
          expenses set forth in clause (ii) above) or the Holders and
          underwriting discounts and commissions and transfer taxes, if
          any, relating to the sale or disposition of Registrable
          Securities by a Holder.
                    "Registration Statement" 
                     ----------------------
                    shall mean any registration statement of the Company
          that covers any of the Exchange Securities or Registrable
          Securities pursuant to the provisions of this Agreement and all
          amendments and supplements to any such Registration Statement,
          including post-effective amendments, in each case including the
          Prospectus contained therein, all exhibits thereto and all
          material incorporated by reference therein.
                    "SEC" shall mean the Securities and Exchange Commission.
                     ---
                    "Shelf Registration" 
                     ------------------
                    shall mean a registration effected pursuant to Section
          2(b) hereof.
                    "Shelf Registration Statement" 
                     ----------------------------
                    shall mean a "shelf" registration statement of the
          Company pursuant to the provisions of Section 2(b) of this
          Agreement which covers all of the Registrable Securities (but no
          other securities unless approved by the Holders whose Registrable
          Securities are covered by such Shelf Registration Statement) on
          an appropriate form under Rule 415 under the 1933 Act, or any
          similar rule that may be adopted by the SEC, and all amendments
          and supplements to such registration statement, including post-
          effective amendments, in each case including the Prospectus
          contained therein, all exhibits thereto and all material
          incorporated by reference therein.
                    "Trustee" shall mean the trustee with respect to the
                     ------- 
          Securities under the Indenture.
                    "Underwritten Registration" or "Underwritten Offering"
                     -------------------------      ---------------------
          shall mean a registration in which Registrable Securities
          are sold to an Underwriter (as hereinafter defined) for reoffering
          to the public.
                    2.   Registration Under the 1933 Act.
                         -------------------------------
                    (a)  To the extent not prohibited by any applicable law
          or applicable interpretation of the Staff of the SEC, the Company
          shall use its best efforts to cause to be filed an Exchange Offer
          Registration Statement covering the offer by the Company to the
          Holders to exchange all of the Registrable Securities for
          Exchange Securities and to have such Registration Statement
          declared effective by the SEC and remain effective until the
          closing of the Exchange Offer.  The Company shall commence the
          Exchange Offer promptly after the Exchange Offer Registration
          Statement has been declared effective by the SEC and use its best
          efforts to have the Exchange Offer consummated on or prior to
          October 27, 1998.  The Company shall commence the Exchange Offer
          by mailing the related exchange offer Prospectus and accompanying
          documents to each Holder stating, in addition to such other
          disclosures as are required by applicable law:
                    (i)  that the Exchange Offer is being made pursuant to
               this Agreement and that all Registrable Securities validly
               tendered will be accepted for exchange;
                    (ii) the dates of acceptance for exchange (which shall
               be a period of at least 20 business days from the date such
               notice is mailed) (the "Exchange Dates");
                    (iii)  that any Registrable Security not tendered
               will remain outstanding and continue to accrete in value
               (until May 1, 2003 and thereafter will accrue interest) but
               will not retain any rights under this Agreement;
                    (iv) that Holders electing to have a Registrable
               Security exchanged pursuant to the Exchange Offer will be
               required to surrender such Registrable Security, together
               with the enclosed letters of transmittal, to the institution
               and at the address (located in the Borough of Manhattan, The
               City of New York) specified in the notice prior to the close
               of business on the last Exchange Date; and
                    (v)  that Holders will be entitled to withdraw their
               election, not later than the close of business on the last
               Exchange Date, by sending to the institution and at the
               address (located in the Borough of Manhattan, The City of
               New York) specified in the notice a telegram, telex,
               facsimile transmission or letter setting forth the name of
               such Holder, the principal amount of Registrable Securities
               delivered for exchange and a statement that such Holder is
               withdrawing his election to have such Securities exchanged.
                    As soon as practicable after the last Exchange Date,
          the Company shall:
                    (i)  accept for exchange Registrable Securities or
               portions thereof tendered and not validly withdrawn pursuant
               to the Exchange Offer; and
                    (ii) deliver, or cause to be delivered, to the Trustee
               for cancellation all Registrable Securities or portions
               thereof so accepted for exchange by the Company and issue,
               and cause the Trustee to promptly authenticate and mail to
               each Holder, an Exchange Security equal in principal amount
               to the principal amount of the Registrable Securities
               surrendered by such Holder.
          The Company shall use its best efforts to complete the Exchange
          Offer as provided above and shall comply with the applicable
          requirements of the 1933 Act, the 1934 Act and other applicable
          laws and regulations in connection with the Exchange Offer.  The
          Exchange Offer shall not be subject to any conditions, other than
          that the Exchange Offer does not violate applicable law or any
          applicable interpretation of the Staff of the SEC.  The Company
          shall inform the Placement Agent of the names and addresses of
          the Holders to whom the Exchange Offer is made, and the Placement
          Agent shall have the right, subject to applicable law, to contact
          such Holders and otherwise facilitate the tender of Registrable
          Securities in the Exchange Offer.
                    (b)  In the event that (i) the Company determines that
          the Exchange Offer Registration provided for in Section 2(a)
          above is not available or may not be consummated as soon as
          practicable after the last Exchange Date because it would violate
          applicable law or the applicable interpretations of the Staff of
          the SEC, (ii) the Exchange Offer is not for any other reason
          consummated by October 27, 1998 or (iii) in the opinion of
          counsel for the Placement Agent a Registration Statement must be
          filed and a Prospectus must be delivered by the Placement Agent
          in connection with any offering or sale of Registrable
          Securities, the Company shall use its best efforts to cause to be
          filed as soon as practicable after such determination, date or
          notice of such opinion of counsel is given to the Company, as the
          case may be, a Shelf Registration Statement providing for the
          sale by the Holders of all of the Registrable Securities and to
          have such Shelf Registration Statement declared effective by the
          SEC.  In the event the Company is required to file a Shelf
          Registration Statement solely as a result of the matters referred
          to in clause (iii) of the preceding sentence, the Company shall
          use its best efforts to file and have declared effective by the
          SEC both an Exchange Offer Registration Statement pursuant to
          Section 2(a) with respect to all Registrable Securities and a
          Shelf Registration Statement (which may be a combined
          Registration Statement with the Exchange Offer Registration
          Statement) with respect to offers and sales of Registrable
          Securities held by the Placement Agent after completion of the
          Exchange Offer.  The Company agrees to use its best efforts to
          keep the Shelf Registration Statement continuously effective
          until the period referred to in  Rule 144(k) or until all of the
          Registrable Securities covered by the Shelf Registration
          Statement have been sold pursuant to the Shelf Registration
          Statement.  The Company further agrees to supplement or amend the
          Shelf Registration Statement if required by the rules,
          regulations or instructions applicable to the registration form
          used by the Company for such Shelf Registration Statement or by
          the 1933 Act or by any other rules and regulations thereunder for
          shelf registration or if reasonably requested by a Holder with
          respect to information relating to such Holder, and to use its
          best efforts to cause any such amendment to become effective and
          such Shelf Registration Statement to become usable as soon as
          thereafter practicable.  The Company agrees to furnish to the
          Holders of Registrable Securities copies of any such supplement
          or amendment promptly after its being used or filed with the SEC.
                    (c)  The Company shall pay all Registration Expenses in
          connection with the registration pursuant to Section 2(a) or
          Section 2(b).  Each Holder shall pay all underwriting discounts
          and commissions and transfer taxes, if any, relating to the sale
          or disposition of such Holder's Registrable Securities pursuant
          to the Shelf Registration Statement.
                    (d)  An Exchange Offer Registration Statement pursuant
          to Section 2(a) hereof or a Shelf Registration Statement pursuant
          to Section 2(b) hereof will not be deemed to have become
          effective unless it has been declared effective by the SEC;
          provided, however, that, if, after it has been declared effective,
          --------  -------
          the offering of Registrable Securities pursuant to a Shelf
          Registration Statement is interfered with by any stop order,
          injunction or other order or requirement of the SEC or any other
          governmental agency or court, such Registration Statement will be
          deemed not to have become effective during the period of such
          interference until the offering of Registrable Securities pursuant
          to such Registration Statement may legally resume.  As provided
          for in the Indenture, in the event the Exchange Offer is not
          consummated and the Shelf Registration Statement is not declared
          effective on or prior to October 27, 1998, interest (in addition
          to the accrual of original issue discount during the period ending
          May 1, 2003 and in addition to the interest otherwise due on the
          Securities after such date) will accrue, at an annual rate of .5% of
          Accreted Value on the preceding semiannual payment date, on the
          Securities from October 27, 1998, payable in cash semiannually in
          arrears on each May 1 and November 1, commencing May 1, 1999, until
          the Exchange Offer is consummated or the Shelf Registration Statement
          is declared effective; provided that, if a Shelf Registration
                                 --------
          Statement is required solely by the matters referred to in clause
          (iii) of the first sentence of Section 2(b), such increase in
          interest rate shall be payable only to the Placement Agent, with
          respect to Securities held by it, and only with respect to any
          period (from October 27, 1998) during which such Shelf Registration
          Statement is not effective.
                    (e)  Without limiting the remedies available to the
          Placement Agent and the Holders, the Company acknowledges that
          any failure by the Company to comply with its obligations under
          Section 2(a) and Section 2(b) hereof may result in material
          irreparable injury to the Placement Agent or the Holders for
          which there is no adequate remedy at law, that it will not be
          possible to measure damages for such injuries precisely and that,
          in the event of any such failure, the Placement Agent or any
          Holder may obtain such relief as may be required to specifically
          enforce the Company's obligations under Section 2(a) and
          Section 2(b) hereof.
                    3.   Registration Procedures.
                         -----------------------
                    In connection with the obligations of the Company with
          respect to the Registration Statements pursuant to Section 2(a)
          and Section 2(b) hereof, the Company shall as expeditiously as
          possible:
                    (a)  prepare and file with the SEC a Registration
               Statement on the appropriate form under the 1933 Act, which
               form (x) shall be selected by the Company and (y) shall, in
               the case of a Shelf Registration, be available for the sale
               of the Registrable Securities by the selling Holders thereof
               and (z) shall comply as to form in all material respects
               with the requirements of the applicable form and include all
               financial statements required by the SEC to be filed
               therewith, and use its best efforts to cause such
               Registration Statement to become effective and remain
               effective in accordance with Section 2 hereof;
                    (b)  prepare and file with the SEC such amendments and
               post-effective amendments to each Registration Statement as
               may be necessary to keep such Registration Statement
               effective for the applicable period and cause each
               Prospectus to be supplemented by any required prospectus
               supplement and, as so supplemented, to be filed pursuant to
               Rule 424 under the 1933 Act; to keep each Prospectus current
               during the period described under Section 4(3) and Rule 174
               under the 1933 Act that is applicable to transactions by
               brokers or dealers with respect to the Registrable
               Securities or Exchange Securities;
                    (c)  in the case of a Shelf Registration, furnish to
               each Holder of Registrable Securities, to counsel for the
               Placement Agent, to counsel for the Holders and to each
               Underwriter of an Underwritten Offering of Registrable
               Securities, if any, without charge, as many copies of each
               Prospectus, including each preliminary Prospectus, and any
               amendment or supplement thereto and such other documents as
               such Holder or Underwriter may reasonably request, in order
               to facilitate the public sale or other disposition of the
               Registrable Securities; and the Company consents to the use
               of such Prospectus and any amendment or supplement thereto
               in accordance with applicable law by each of the selling
               Holders of Registrable Securities and any such Underwriters
               in connection with the offering and sale of the Registrable
               Securities covered by and in the manner described in such
               Prospectus or any amendment or supplement thereto in
               accordance with applicable law;
                    (d)  use its best efforts to register or qualify, by
               the time the applicable Registration Statement is declared
               effective by the SEC, the Registrable Securities under all
               applicable state securities or "blue sky" laws of such
               jurisdictions as any Holder of Registrable Securities
               covered by a Registration Statement shall reasonably request
               in writing, to cooperate with such Holders in connection
               with any filings required to be made with the National
               Association of Securities Dealers, Inc. and do any and all
               other acts and things which may be reasonably necessary or
               advisable to enable such Holder to consummate the
               disposition in each such jurisdiction of such Registrable
               Securities owned by such Holder; provided, however, that
                                                --------  -------
               the Company shall not be required to (i) qualify as a
               foreign corporation or as a dealer in securities in any
               jurisdiction where it would not otherwise be required to
               qualify but for this Section 3(d), (ii) file any general
               consent to service of process or (iii) subject itself to
               taxation in any such jurisdiction if it is not otherwise so
               subject;
                    (e)  in the case of a Shelf Registration, notify each
               Holder of Registrable Securities, counsel for the Holders
               and counsel for the Placement Agent promptly and, if
               requested by any such Holder or counsel, confirm such advice
               in writing (i) when a Registration Statement has become
               effective and when any post-effective amendment thereto has
               been filed and becomes effective, (ii) of any request by the
               SEC or any state securities authority for amendments and
               supplements to a Registration Statement and Prospectus or
               for additional information after the Registration Statement
               has become effective, (iii) of the issuance by the SEC or
               any state securities authority of any stop order suspending
               the effectiveness of a Registration Statement or the
               initiation of any proceedings for that purpose, (iv) if,
               between the effective date of a Registration Statement and
               the closing of any sale of Registrable Securities covered
               thereby, the representations and warranties of the Company
               contained in any underwriting agreement, securities sales
               agreement or other similar agreement, if any, relating to
               the offering cease to be true and correct in all material
               respects or if the Company receives any notification with
               respect to the suspension of the qualification of the
               Registrable Securities for sale in any jurisdiction or the
               initiation of any proceeding for such purpose, (v) of the
               happening of any event during the period a Shelf
               Registration Statement is effective which makes any
               statement made in such Registration Statement or the related
               Prospectus untrue in any material respect or which requires
               the making of any changes in such Registration Statement or
               Prospectus in order to make the statements therein not
               misleading and (vi) of any determination by the Company that
               a post-effective amendment to a Registration Statement would
               be appropriate;
                    (f)  make every reasonable effort to obtain the
               withdrawal of any order suspending the effectiveness of a
               Registration Statement at the earliest possible moment and
               provide immediate notice to each Holder of the withdrawal of
               any such order;
                    (g)  in the case of a Shelf Registration, furnish to
               each Holder of Registrable Securities, without charge, at
               least one conformed copy of each Registration Statement and
               any post-effective amendment thereto (without documents
               incorporated therein by reference or exhibits thereto,
               unless requested);
                    (h)  in the case of a Shelf Registration, cooperate
               with the selling Holders of Registrable Securities to
               facilitate the timely preparation and delivery of
               certificates representing Registrable Securities to be sold
               and not bearing any restrictive legends and enable such
               Registrable Securities to be in such denominations
               (consistent with the provisions of the Indenture) and
               registered in such names as the selling Holders may
               reasonably request at least two business days prior to the
               closing of any sale of Registrable Securities;
                    (i)  in the case of a Shelf Registration, upon the
               occurrence of any event contemplated by Section 3(e)(v)
               hereof, use its best efforts to prepare and file with the
               SEC a supplement or post-effective amendment to a
               Registration Statement or the related Prospectus or any
               document incorporated therein by reference or file any other
               required document so that, as thereafter delivered to the
               purchasers of the Registrable Securities, such Prospectus
               will not contain any untrue statement of a material fact or
               omit to state a material fact necessary to make the
               statements therein, in light of the circumstances under
               which they were made, not misleading.  The Company agrees to
               notify the Holders to suspend use of the Prospectus as
               promptly as practicable after the occurrence of such an
               event, and the Holders hereby agree to suspend use of the
               Prospectus until the Company has amended or supplemented the
               Prospectus to correct such misstatement or omission;
                    (j)  within a reasonable time prior to the filing of
               any Registration Statement, any Prospectus, any amendment to
               a Registration Statement or amendment or supplement to a
               Prospectus or any document which is to be incorporated by
               reference into a Registration Statement or a Prospectus
               after initial filing of a Registration Statement, provide
               copies of such document to the Placement Agent and its
               counsel (and, in the case of a Shelf Registration Statement,
               the Holders and their counsel) and make such of the
               representatives of the Company as shall be reasonably
               requested by the Placement Agent or its counsel (and, in the
               case of a Shelf Registration Statement, the Holders or their
               counsel) available for discussion of such document, and
               shall not at any time file or make any amendment to the
               Registration Statement, any Prospectus or any amendment of
               or supplement to a Registration Statement or a Prospectus or
               any document which is to be incorporated by reference into a
               Registration Statement or a Prospectus, of which the
               Placement Agent and its counsel (and, in the case of a Shelf
               Registration Statement, the Holders and their counsel) shall
               not have previously been advised and furnished a copy or to
               which the Placement Agent or its counsel (and, in the case
               of a Shelf Registration Statement, the Holders or their
               counsel) shall object, except for any amendment or
               supplement or document (a copy of which has been previously
               furnished to the Placement Agent and its counsel (and, in
               the case of a Shelf Registration Statement, the Holders and
               their counsel)) which counsel to the Company shall advise
               the Company, in the form of a written legal opinion, is
               required in order to comply with applicable law; the
               Placement Agent agrees that, if it receives timely notice
               and drafts under this clause (j), it will not take actions
               or make objections pursuant to this clause (j) such that the
               Company is unable to comply with its obligations under
               Section 2(a);
                    (k)  obtain a CUSIP number and, if applicable, a CINS
               number, for all Exchange Securities or Registrable
               Securities, as the case may be, not later than the effective
               date of a Registration Statement;
                    (l)  cause the Indenture to be qualified under the
               Trust Indenture Act of 1939, as amended (the "TIA"), in
               connection with the registration of the Exchange Securities
               or Registrable Securities, as the case may be, cooperate
               with the Trustee and the Holders to effect such changes to
               the Indenture as may be required for the Indenture to be so
               qualified in accordance with the terms of the TIA and
               execute, and use its best efforts to cause the Trustee to
               execute, all documents as may be required to effect such
               changes and all other forms and documents required to be
               filed with the SEC to enable the Indenture to be so
               qualified in a timely manner;
                    (m)  in the case of a Shelf Registration, make
               available for inspection by a representative of the Holders
               of the Registrable Securities, any Underwriter participating
               in any disposition pursuant to such Shelf Registration
               Statement, and attorneys and accountants designated by the
               Holders, at reasonable times and in a reasonable manner, all
               financial and other records, pertinent documents and
               properties of the Company, and cause the respective
               officers, directors and employees of the Company to supply
               all information reasonably requested by any such
               representative, Underwriter, attorney or accountant in
               connection with a Shelf Registration Statement;
                    (n)  in the case of a Shelf Registration, use its best
               efforts to cause all Registrable Securities to be listed on
               any securities exchange or any automated quotation system on
               which similar securities issued by the Company are then
               listed if requested by the Majority Holders, to the extent
               such Registrable Securities satisfy applicable listing
               requirements;
                    (o)  use its best efforts to cause the Exchange
               Securities or Registrable Securities, as the case may be, to
               be rated by two nationally recognized statistical rating
               organizations (as such term is defined in Rule 436(g)(2)
               under the ▇▇▇▇ ▇▇▇);
                    (p)  if reasonably requested by any Holder of
               Registrable Securities covered by a Registration Statement,
               (i) promptly incorporate in a Prospectus supplement or post-
               effective amendment such information with respect to such
               Holder as such Holder reasonably requests to be included
               therein and (ii) make all required filings of such
               Prospectus supplement or such post-effective amendment as
               soon as the Company has received notification of the matters
               to be incorporated in such filing; and
                    (q)  in the case of a Shelf Registration, enter into
               such customary agreements and take all such other actions in
               connection therewith (including those requested by the
               Holders of a majority of the Registrable Securities being
               sold) in order to expedite or facilitate the disposition of
               such Registrable Securities including, but not limited to,
               an Underwritten Offering and in such connection, (i) to the
               extent possible, make such representations and warranties to
               the Holders and any Underwriters of such Registrable
               Securities with respect to the business of the Company and
               its subsidiaries, the Registration Statement, Prospectus and
               documents incorporated by reference or deemed incorporated
               by reference, if any, in each case, in form, substance and
               scope as are customarily made by issuers to underwriters in
               underwritten offerings and confirm the same if and when
               requested, (ii) obtain opinions of counsel to the Company
               (which counsel and opinions, in form, scope and substance,
               shall be reasonably satisfactory to the Holders and such
               Underwriters and their respective counsel) addressed to each
               selling Holder and Underwriter of Registrable Securities,
               covering the matters customarily covered in opinions
               requested in underwritten offerings, (iii) obtain "cold
               comfort" letters from the independent certified public
               accountants of the Company (and, if applicable, any other
               certified public accountant of any subsidiary of the
               Company, or of any business acquired by the Company for
               which financial statements and financial data are or are
               required to be included in the Registration Statement)
               addressed to each selling Holder and Underwriter of
               Registrable Securities, such letters to be in customary form
               and covering matters of the type customarily covered in
               "cold comfort" letters in connection with underwritten
               offerings, and (iv) deliver such documents and certificates
               as may be reasonably requested by the Holders of a majority
               in principal amount of the Registrable Securities being sold
               or the Underwriters, and which are customarily delivered in
               underwritten offerings, to evidence the continued validity
               of the representations and warranties of the Company made
               pursuant to clause (i) above and to evidence compliance with
               any customary conditions contained in an underwriting
               agreement. 
                    In the case of a Shelf Registration Statement, the
          Company may require each Holder of Registrable Securities to
          furnish to the Company such information regarding the Holder and
          the proposed distribution by such Holder of such Registrable
          Securities as the Company may from time to time reasonably
          request in writing.  
                    In the case of a Shelf Registration Statement, each
          Holder agrees that, upon receipt of any notice from the Company
          of the happening of any event of the kind described in Section
          3(e)(v) hereof, such Holder will forthwith discontinue
          disposition of Registrable Securities pursuant to a Registration
          Statement until such Holder's receipt of the copies of the
          supplemented or amended Prospectus contemplated by Section 3(i)
          hereof, and, if so directed by the Company, such Holder will
          deliver to the Company (at its expense) all copies in its
          possession, other than permanent file copies then in such
          Holder's possession, of the Prospectus covering such Registrable
          Securities current at the time of receipt of such notice.  If the
          Company shall give any such notice to suspend the disposition of
          Registrable Securities pursuant to a Registration Statement, the
          Company shall extend the period during which the Registration
          Statement shall be maintained effective pursuant to this
          Agreement by the number of days during the period from and
          including the date of the giving of such notice to and including
          the date when the Holders shall have received copies of the
          supplemented or amended Prospectus necessary to resume such
          dispositions.
                    The Holders of Registrable Securities covered by a
          Shelf Registration Statement who desire to do so may sell such
          Registrable Securities in an Underwritten Offering.  In any such
          Underwritten Offering, the investment banker or investment
          bankers and manager or managers (the "Underwriters") that will
          administer the offering will be selected by the Majority Holders
          of the Registrable Securities included in such offering.
                    4.   Participation of Broker-Dealers in Exchange Offer.
                         -------------------------------------------------
                    (a)  The Staff of the SEC has taken the position that
          any broker-dealer that receives Exchange Securities for its own
          account in the Exchange Offer in exchange for Securities that
          were acquired by such broker-dealer as a result of market-making
          or other trading activities (a "Participating Broker-Dealer"),
          may be deemed to be an "underwriter" within the meaning of the
          1933 Act and must deliver a prospectus meeting the requirements
          of the 1933 Act in connection with any resale of such Exchange
          Securities.
                    The Company understands that it is the Staff's position
          that if the Prospectus contained in the Exchange Offer
          Registration Statement includes a plan of distribution containing
          a statement to the above effect and the means by which
          Participating Broker-Dealers may resell the Exchange Securities,
          without naming the Participating Broker-Dealers or specifying the
          amount of Exchange Securities owned by them, such Prospectus may
          be delivered by Participating Broker-Dealers to satisfy their
          prospectus delivery obligation under the 1933 Act in connection
          with resales of Exchange Securities for their own accounts, so
          long as the Prospectus otherwise meets the requirements of the
          1933 Act.
                    (b)  In light of the above, notwithstanding the other
          provisions of this Agreement, the Company agrees that the
          provisions of this Agreement as they relate to a Shelf
          Registration shall also apply to an Exchange Offer Registration
          to the extent, and with such reasonable modifications thereto as
          may be, reasonably requested by the Placement Agent or by one or
          more Participating Broker-Dealers, in each case as provided in
          clause (ii) below, in order to expedite or facilitate the
          disposition of any Exchange Securities by Participating Broker-
          Dealers consistent with the positions of the Staff recited in
          Section 4(a) above; provided that:
                              --------
                    (i)  the Company shall not be required to amend or
               supplement the Prospectus contained in the Exchange Offer
               Registration Statement, as would otherwise be contemplated
               by Section 3(i) of this Agreement, for a period exceeding 60
               days after the last Exchange Date (as such period may be
               extended pursuant to the penultimate paragraph of Section 3
               of this Agreement) and Participating Broker-Dealers shall
               not be authorized by the Company to deliver and shall not
               deliver such Prospectus after such period in connection with
               the resales contemplated by this Section 4; and
                    (ii) the application of the Shelf Registration
               procedures set forth in Section 3 of this Agreement to an
               Exchange Offer Registration, to the extent not required by
               the positions of the Staff of the SEC or the 1933 Act and
               the rules and regulations thereunder, will be in conformity
               with the reasonable request to the Company by the Placement
               Agent or with the reasonable request in writing to the
               Company by one or more broker-dealers who certify to the
               Placement Agent and the Company in writing that they
               anticipate that they will be Participating Broker-Dealers;
               and provided further that, in
                   ------- -------
               connection with such application of the Shelf Registration
               procedures set forth in Section 3 to an Exchange Offer
               Registration, the Company shall be obligated (x) to deal
               only with one entity representing the Participating Broker-
               Dealers, which shall be the Placement Agent unless it elects
               not to act as such representative, (y) to pay the fees and
               expenses of only one counsel representing the Participating
               Broker-Dealers, which shall be counsel to the Placement
               Agent unless such counsel elects not to so act and (z) to
               cause to be delivered only one, if any, "cold comfort"
               letter with respect to the Prospectus in the form existing
               on the last Exchange Date and with respect to each
               subsequent amendment or supplement, if any, effected during
               the period specified in clause (i) above.
                    (c)  The Placement Agent shall have no liability to the
          Company or any Holder with respect to any request that it may
          make pursuant to Section 4(b) above.
                    5.   Indemnification and Contribution.
                         --------------------------------
                    (a)  The Company agrees to indemnify and hold harmless
          the Placement Agent, each Holder and each Person, if any, who
          controls the Placement Agent or any Holder within the meaning of
          either Section 15 of the 1933 Act or Section 20 of the 1934 Act,
          or is under common control with, or is controlled by, the
          Placement Agent or any Holder, from and against all losses,
          claims, damages and liabilities (including, without limitation,
          any legal or other expenses reasonably incurred by the Placement
          Agent, any Holder or any such controlling or affiliated Person in
          connection with defending or investigating any such action or
          claim) caused by any untrue statement or alleged untrue statement
          of a material fact contained in any Registration Statement (or
          any amendment thereto) pursuant to which Exchange Securities or
          Registrable Securities were registered under the 1933 Act,
          including all documents incorporated therein by reference, or
          caused by any omission or alleged omission to state therein a
          material fact required to be stated therein or necessary to make
          the statements therein not misleading, or caused by any untrue
          statement or alleged untrue statement of a material fact
          contained in any Prospectus (as amended or supplemented if the
          Company shall have furnished any amendments or supplements
          thereto), or caused by any omission or alleged omission to state
          therein a material fact necessary to make the statements therein
          in light of the circumstances under which they were made not
          misleading, except insofar as such losses, claims, damages or
          liabilities are caused by any such untrue statement or omission
          or alleged untrue statement or omission based upon information
          relating to the Placement Agent or any Holder furnished to the
          Company in writing by the Placement Agent or any selling Holder
          expressly for use therein.  In connection with any Underwritten
          Offering permitted by Section 3 of this Agreement, the Company
          will also indemnify the Underwriters, if any, selling brokers,
          dealers and similar securities industry professionals
          participating in the distribution, their officers and directors
          and each Person who controls such Persons (within the meaning of
          the 1933 Act and the ▇▇▇▇ ▇▇▇) to the same extent as provided
          above with respect to the indemnification of the Holders, if
          requested in connection with any Registration Statement.
                    (b)  Each Holder agrees, severally and not jointly, to
          indemnify and hold harmless the Company, the Placement Agent and
          the other selling Holders, and each of their respective
          directors, officers who sign the Registration Statement and each
          Person, if any, who controls the Company, the Placement Agent and
          any other selling Holder within the meaning of either Section 15
          of the 1933 Act or Section 20 of the 1934 Act to the same extent
          as the foregoing indemnity from the Company to the Placement
          Agent and the Holders, but only with reference to information
          relating to such Holder furnished to the Company in writing by
          such Holder expressly for use in any Registration Statement (or
          any amendment thereto) or any Prospectus (or any amendment or
          supplement thereto).
                    (c)  In case any proceeding (including any governmental
          investigation) shall be instituted involving any Person in
          respect of which indemnity may be sought pursuant to either
          paragraph (a) or paragraph (b) above, such Person (the
          "indemnified party") shall promptly notify the Person against
          whom such indemnity may be sought (the "indemnifying party") in
          writing and the indemnifying party, upon request of the
          indemnified party, shall retain counsel reasonably satisfactory
          to the indemnified party to represent the indemnified party and
          any others the indemnifying party may designate in such
          proceeding and shall pay the fees and disbursements of such
          counsel related to such proceeding.  In any such proceeding, any
          indemnified party shall have the right to retain its own counsel,
          but the fees and expenses of such counsel shall be at the expense
          of such indemnified party unless (i) the indemnifying party and
          the indemnified party shall have mutually agreed to the retention
          of such counsel or (ii) the named parties to any such proceeding
          (including any impleaded parties) include both the indemnifying
          party and the indemnified party and representation of both
          parties by the same counsel would be inappropriate due to actual
          or potential differing interests between them.  It is understood
          that the indemnifying party shall not, in connection with any
          proceeding or related proceedings in the same jurisdiction, be
          liable for (a) the fees and expenses of more than one separate
          firm (in addition to any local counsel) for the Placement Agent
          and all Persons, if any, who control the Placement Agent within
          the meaning of either Section 15 of the 1933 Act or ▇▇▇▇▇▇▇ ▇▇ ▇▇
          ▇▇▇ ▇▇▇▇ ▇▇▇, (▇) the fees and expenses of more than one separate
          firm (in addition to any local counsel) for the Company, its
          directors, its officers who sign the Registration Statement and
          each person, if any, who controls the Company within the meaning
          of either such Section and (c) the fees and expenses of more than
          one separate firm (in addition to any local counsel) for all
          Holders and all Persons, if any, who control any Holders within
          the meaning of either such Section, and that all such fees and
          expenses shall be reimbursed as they are incurred.  In such case
          involving the Placement Agent and Persons who control the
          Placement Agent, such firm shall be designated in writing by the
          Placement Agent.  In such case involving the Holders and such
          Persons who control Holders, such firm shall be designated in
          writing by the Majority Holders.  In all other cases, such firm
          shall be designated by the Company.  The indemnifying party shall
          not be liable for any settlement of any proceeding effected
          without its written consent but, if settled with such consent or
          if there be a final judgment for the plaintiff, the indemnifying
          party agrees to indemnify the indemnified party from and against
          any loss or liability by reason of such settlement or judgment. 
          Notwithstanding the foregoing sentence, if at any time an
          indemnified party shall have requested an indemnifying party to
          reimburse the indemnified party for fees and expenses of counsel
          as contemplated by the second and third sentences of this
          paragraph, the indemnifying party agrees that it shall be liable
          for any settlement of any proceeding effected without its written
          consent if (i) such settlement is entered into more than 30 days
          after receipt by such indemnifying party of the aforesaid request
          and (ii) such indemnifying party shall not have reimbursed the
          indemnified party for such fees and expenses of counsel in
          accordance with such request prior to the date of such
          settlement.  No indemnifying party shall, without the prior
          written consent of the indemnified party, effect any settlement
          of any pending or threatened proceeding in respect of which such
          indemnified party is or could have been a party and indemnity
          could have been sought hereunder by such indemnified party,
          unless such settlement includes an unconditional release of such
          indemnified party from all liability on claims that are the
          subject matter of such proceeding.
                    (d)  If the indemnification provided for in paragraph
          (a) or paragraph (b) of this Section 4 is unavailable to an
          indemnified party or insufficient in respect of any losses,
          claims, damages or liabilities, then each indemnifying party
          under such paragraph, in lieu of indemnifying such indemnified
          party thereunder, shall contribute to the amount paid or payable
          by such indemnified party as a result of such losses, claims,
          damages or liabilities in such proportion as is appropriate to
          reflect the relative fault of the indemnifying party or parties
          on the one hand and of the indemnified party or parties on the
          other hand in connection with the statements or omissions that
          resulted in such losses, claims, damages or liabilities, as well
          as any other relevant equitable considerations.  The relative
          fault of the Company and the Holders shall be determined by
          reference to, among other things, whether the untrue or alleged
          untrue statement of a material fact or the omission or alleged
          omission to state a material fact relates to information supplied
          by the Company or by the Holders and the parties' relative
          intent, knowledge, access to information and opportunity to
          correct or prevent such statement or omission.  The Holders'
          respective obligations to contribute pursuant to this Section
          5(d) are several in proportion to the respective principal amount
          of Registrable Securities of such Holder that were registered
          pursuant to a Registration Statement.  
                    (e)  The Company and each Holder agree that it would
          not be just or equitable if contribution pursuant to this Section
          5 were determined by pro rata allocation or by any other method
                               --- ----
          of allocation that does not take account of the equitable
          considerations referred to in paragraph (d) above.  The amount
          paid or payable by an indemnified party as a result of the losses,
          claims, damages and liabilities referred to in paragraph (d) above
          shall be deemed to include, subject to the limitations set forth
          above, any legal or other expenses reasonably incurred by such
          indemnified party in connection with investigating or defending
          any such action or claim. Notwithstanding the provisions of this
          Section 5, no Holder shall be required to indemnify or contribute
          any amount in excess of the amount by which the total price at
          which Registrable Securities were sold by such Holder exceeds the
          amount of any damages that such Holder has otherwise been required
          to pay by reason of such untrue or alleged untrue statement or
          omission or alleged omission.  No Person guilty of fraudulent
          misrepresentation (within the meaning of Section 11(f) of the
          ▇▇▇▇ ▇▇▇) shall be entitled to contribution from any Person who
          was not guilty of such fraudulent misrepresentation.  The
          remedies provided for in this Section 5 are not exclusive and
          shall not limit any rights or remedies which may otherwise be
          available to any indemnified party at law or in equity.
                    The indemnity and contribution provisions contained in
          this Section 5 shall remain operative and in full force and
          effect regardless of (i) any termination of this Agreement, (ii)
          any investigation made by or on behalf of the Placement Agent,
          any Holder or any Person controlling the Placement Agent or any
          Holder, or by or on behalf of the Company, its officers or
          directors or any Person controlling the Company, (iii) acceptance
          of any of the Exchange Securities and (iv) any sale of
          Registrable Securities pursuant to a Shelf Registration
          Statement.
                    6.   Miscellaneous.
                         -------------
                    (a)  No Inconsistent Agreements.  The Company has not
                         --------------------------
          entered into, and on or after the date of this Agreement will not
          enter into, any agreement which is inconsistent with the rights
          granted to the Holders of Registrable Securities in this Agreement
          or otherwise conflicts with the provisions hereof.  The rights
          granted to the Holders hereunder do not in any way conflict with
          and are not inconsistent with the rights granted to the holders
          of the Company's other issued and outstanding securities under
          any such agreements.
                    (b)  Amendments and Waivers.  The provisions of this
                         ----------------------
          Agreement, including the provisions of this sentence, may not be
          amended, modified or supplemented, and waivers or consents to
          departures from the provisions hereof may not be given unless the
          Company has obtained the written consent of Holders of at least a
          majority in aggregate principal amount of the outstanding
          Registrable Securities affected by such amendment, modification,
          supplement, waiver or consent; provided, however, that no
                                         --------  -------
          amendment, modification, supplement, waiver or consents to any
          departure from the provisions of Section 5 hereof shall be
          effective as against any Holder of Registrable Securities unless
          consented to in writing by such Holder.
                    (c)  Notices.  All notices and other communications
                         --------
          provided for or permitted hereunder shall be made in writing by
          hand-delivery, registered first-class mail, telex, telecopier, or
          any courier guaranteeing overnight delivery (i) if to a Holder, at
          the most current address given by such Holder to the Company by
          means of a notice given in accordance with the provisions of this
          Section 6(c), which address initially is, with respect to the
          Placement Agent, the address set forth in the Indenture, and (ii)
          if to the Company, initially at the Company's address set forth in
          the Indenture and thereafter at such other address, notice of which
          is given in accordance with the provisions of this Section 6(c).
                    All such notices and communications shall be deemed to
          have been duly given:  at the time delivered by hand, if
          personally delivered; five business days after being deposited in
          the mail, postage prepaid, if mailed; when answered back, if
          telexed; when receipt is acknowledged, if telecopied; and on the
          next business day if timely delivered to an air courier
          guaranteeing overnight delivery.
                    Copies of all such notices, demands, or other
          communications shall be concurrently delivered by the person
          giving the same to the Trustee, at the address specified in the
          Indenture.
                    (d)  Successors and Assigns.  This Agreement shall
                         ----------------------
          inure to the benefit of and be binding upon the successors, assigns
          and transferees of each of the parties, including, without
          limitation and without the need for an express assignment,
          subsequent Holders; provided that nothing herein
                              --------
          shall be deemed to permit any assignment, transfer or other
          disposition of Registrable Securities in violation of the terms
          of the Placement Agreement.  If any transferee of any Holder
          shall acquire Registrable Securities, in any manner, whether by
          operation of law or otherwise, such Registrable Securities shall
          be held subject to all of the terms of this Agreement, and by
          taking and holding such Registrable Securities such person shall
          be conclusively deemed to have agreed to be bound by and to
          perform all of the terms and provisions of this Agreement and
          such person shall be entitled to receive the benefits hereof. 
          The Placement Agent (in its capacity as Placement Agent) shall
          have no liability or obligation to the Company with respect to
          any failure by a Holder to comply with, or any breach by any
          Holder of, any of the obligations of such Holder under this
          Agreement.
                    (e)  Purchases and Sales of Securities.  The Company
                         ---------------------------------
          shall not, and shall use its best efforts to cause its affiliates
          (as defined in Rule 405 under the ▇▇▇▇ ▇▇▇) not to, purchase and then
          resell or otherwise transfer any Notes.
                    (f)  Third Party Beneficiary.  The Holders shall be
                         -----------------------
          third party beneficiaries to the agreements made hereunder between
          the Company, on the one hand, and the Placement Agent, on the other
          hand, and each Holder shall have the right to enforce such
          agreements directly to the extent it deems such enforcement
          necessary or advisable to protect its rights or the rights of
          Holders hereunder.
                    (g)  Counterparts.  This Agreement may be executed
                         ------------
          manually or by facsimile in any number of counterparts and by the
          parties hereto in separate counterparts, each of which when so
          executed shall be deemed to be an original and all of which taken
          together shall constitute one and the same agreement.
                    (h)  Headings.  The headings in this Agreement are for
                         --------
          convenience of reference only and shall not limit or otherwise
          affect the meaning hereof.
                    (i)  Governing Law; Submission to Jurisdiction.  This
                         -----------------------------------------
          Agreement shall be governed by and construed in accordance with the
          laws of the State of New York.  The Company agrees to submit to the
          jurisdiction of any federal or state court located in the City of
          New York in any suit, action or proceeding with respect to this
          Agreement and for actions brought under the U.S. federal or state
          securities laws brought in any such court.
                    (j)  Severability.  In the event that any one or more
                         ------------
          of the provisions contained herein, or the application thereof in
          any circumstance, is held invalid, illegal or unenforceable, the
          validity, legality and enforceability of any such provision in
          every other respect and of the remaining provisions contained
          herein shall not be affected or impaired thereby.
     
                    IN WITNESS WHEREOF, the parties have executed this
          Agreement as of the date first written above.
                                          ICG SERVICES, INC.
                                          By: /s/ ▇▇▇ ▇▇▇▇▇▇
                                             -------------------------
                                             Name:  H. ▇▇▇ ▇▇▇▇▇▇
                                             Title:  Executive Vice President,
                                                     General Counsel and
                                                     Secretary
          Confirmed and accepted as of
            the date first above written:
          ▇▇▇▇▇▇ ▇▇▇▇▇▇▇ & CO. INCORPORATED
          By: /s/ ▇▇▇▇▇ ▇. ▇▇▇▇▇ 
             ------------------------------
             Name:  ▇▇▇▇▇ ▇. ▇▇▇▇▇
             Title:  Principal