Exhibit 4.12


                                    [FACE OF NOTE]

                                  ICG HOLDINGS, INC.

                        11 5/8% Senior Discount Note Due 2007

                                                       [CUSIP] [CINS]           
                                                                    ----------


     No.                                                            $_________


               The following information is supplied for purposes of Sections
     1273 and 1275 of the Internal Revenue Code:


     Issue Date:    March 11, 1997

     Yield to maturity for period from Issue Date to March 15, 2007:  11.62%
     (rounded to two decimal places), compounded semiannually on March 15 and
     September 15 commencing March 11, 1997 (computed without giving effect to
     the additional payments of interest in the event the issuer fails to
     commence the exchange offer and fails to cause the shelf registration
     statement to be declared effective, each as referred to on the reverse
     hereof)

     Original issue discount under Section 1273 of the Internal Revenue Code
     (for each $1,000 principal amount at maturity):   $1,013.59

     Issue Price (for each $1,000 principal amount at maturity):  $567.66

               ICG HOLDINGS, INC., a Colorado corporation (the "Company", which
     term includes any successor under the Indenture hereinafter referred to),
     for value received, promises to pay to [            ], or its registered 
                                             ------------
     assigns, the principal sum of [     ] ($[     ]) on March 15, 2007.
                                    -----     -----

               Interest Payment Dates:  March 15 and September 15, commencing
     September 15, 2002.

               Regular Record Dates:  March 1 and September 1.



     



               Reference is hereby made to the further provisions of this Note
     set forth on the reverse hereof, which further provisions shall for all
     purposes have the same effect as if set forth at this place.

               IN WITNESS WHEREOF, the Company has caused this Note to be signed
     manually or by facsimile by its duly authorized officers.


     Date:  [               ]               ICG HOLDINGS, INC.
             ---------------


                                            By:

                                               --------------------------------
                                               Name:
                                               Title:

     Attest:
                Name:
                Title:



                  (Form of Trustee's Certificate of Authentication)

     This is one of the 11 5/8% Senior Discount Notes due 2007 described in the
     within-mentioned Indenture.


                                            NORWEST BANK COLORADO,
                                            NATIONAL ASSOCIATION, as Trustee


                                            By:
                                               --------------------------------
                                                     Authorized Signatory

     



                                [REVERSE SIDE OF NOTE]

                                  ICG HOLDINGS, INC.

                        11 5/8% Senior Discount Note due 2007



     1.   Principal and Interest.
           ----------------------

               The Company will pay the principal of this 11 5/8% Senior
     Discount Note due 2007 (the "Note") on March 15, 2007.

               The Company promises to pay interest on the principal amount of
     this Note on each Interest Payment Date, as set forth below, at the rate
     per annum shown above.

               Interest will be payable semiannually (to the holders of record
     of the Notes at the close of business on the March 1 or September 1
     immediately preceding the Interest Payment Date) on each Interest Payment
     Date, commencing September 15, 2002; provided that no interest shall accrue
     on the principal amount of this Note prior to March 15, 2002 and no
     interest shall be paid on this Note prior to September 15, 2002, except as
     provided in the next paragraph.

               If an exchange offer registered under the Securities Act is not
     consummated, and a shelf registration statement under the Securities Act
     with respect to resales of the Notes is not declared effective by the
     Commission, on or before September 11, 1997 in accordance with the terms of
     the Registration Rights Agreement dated March 11, 1997 among the Company,
     the Guarantor and Morgan Stanley & Co. Incorporated, interest (in addition
     to the accrual of original discount during the period ending March 15, 2002
     and in addition to the interest otherwise due on the Notes after such date)
     will accrue, at an annual rate of 0.5% of the Accreted Value on the
     preceding Semi-Annual Accrual Date on the Notes, from September 11, 1997,
     payable in cash semiannually, in arrears, on each March 15 and
     September 15, commencing March 15, 1998.  The Holder of this Note is
     entitled to the benefits of such Registration Rights Agreement.

               From and after March 15, 2002, interest on the Notes will accrue
     from the most recent date to which interest has been paid or, if no
     interest has been paid, from March 15, 2002; provided that, if there is no
     existing default in the payment of interest and this Note is authenticated
     between a Regular Record Date referred to on the face hereof and the next
     succeeding Interest Payment Date, interest shall accrue from such Interest
     Payment Date.  Interest will be computed on the basis of a 360-day year of
     twelve 30-day months.

               The Company shall pay interest on overdue principal and premium,
     if any, and interest on overdue installments of interest, to the extent
     lawful, at a rate per annum that is 2% in excess of the rate otherwise
     payable.

     2.   Method of Payment.
          -----------------

               The Company will pay principal as provided above and interest
     (except defaulted interest) on the principal amount of the Notes as
     provided above on each March 15 and September 15 to the persons who are
     Holders (as reflected in the Security Register at the close of business on
     such March 1 and September 1, immediately preceding the Interest Payment
     Date), in each case, even if the Note is cancelled on registration of
     transfer or registration of exchange after such record date; provided that,
     with respect to the payment of principal, the Company will not make payment
     to the Holder unless this Note is surrendered to a Paying Agent.

               The Company will pay principal, premium, if any, and as provided
     above, interest in money of the United States that at the time of payment
     is legal tender for payment of public and private debts.  However, the
     Company may pay principal, premium, if any, and interest by its check
     payable in such money.  It may mail an interest check to a Holder's
     registered address (as reflected in the Security Register).  If a payment
     date is a date other than a Business Day at a place of payment, payment may
     be made at that place on the next succeeding day that is a Business Day and
     no interest shall accrue for the intervening period.

     3.   Paying Agent and Registrar.
          --------------------------

               Initially, the Trustee will act as authenticating agent, Paying
     Agent and Registrar.  The Company may change any authenticating agent,
     Paying Agent or Registrar without notice.  The Company, any Subsidiary or
     any Affiliate of any of them may act as Paying Agent, Registrar or
     co-Registrar.

     4.   Indenture; Issuance of Additional Notes.
          ---------------------------------------

               The Company issued the Notes under an Indenture dated as of
     March 11, 1997 (the "Indenture"), among the Company, ICG Communications,
     Inc., a Delaware corporation (the "Guarantor"), and Norwest Bank Colorado,
     National Association, as trustee (the "Trustee").  Capitalized terms herein
     are used as defined in the Indenture unless otherwise indicated.  The terms
     of the Notes include those stated in the Indenture and those made part of
     the Indenture by reference to the Trust Indenture Act.  The Notes are
     subject to all such terms, and Holders are referred to the Indenture and
     the Trust Indenture Act for a statement of all such terms.  To the extent
     permitted by applicable law, in the event of any inconsistency between the
     terms of this Note and the terms of the Indenture, the terms of the
     Indenture shall control.

               The Notes are general unsecured obligations of the Company.  The
     Indenture provides for an initial original issuance of an aggregate
     principal amount at maturity of Notes  of $176,000,000, plus any Exchange
     Securities that may be issued pursuant to the Registration Rights
     Agreement, and, subject to Article Four of the Indenture, the issuance from
     time to time of additional Notes under the Indenture.

     5.   Redemption.
          ----------

               The Notes will be redeemable, at the Company's option, in whole
     or in part, at any time and from time to time on or after March 15, 2002
     and prior to maturity, upon not less than 30 nor more than 60 days' prior
     notice mailed by first-class mail to each Holder's last address as it
     appears in the Security Register, at the following Redemption Prices
     (expressed in percentages of their principal amount at maturity), plus
     accrued and unpaid interest, if any, to the Redemption Date (subject to the
     right of Holders of record on the relevant Regular Record Date that is on
     or prior to the Redemption Date to receive interest due on an Interest
     Payment Date that is on or prior to the Redemption Date) if redeemed during
     the 12-month period commencing on March 15 of the applicable year set forth
     below:

                                             Redemption
                    Year                         Price    
                    ----                     -------------
                    2002                     105.81250% 
                    2003                     102.90625
                    2004 and thereafter      100.00000

               In addition, at any time on or prior to March 15, 2000, the
     Company may, at its option from time to time, redeem Securities having an
     aggregate principal amount of up to 35% of the aggregate principal amount
     of all Securities issued, at a redemption price equal to 111 5/8% of the
     Accreted Value thereof on the Redemption Date, with proceeds of one or more
     Public Equity Offerings of Common Stock of (A) the Guarantor or (B) the
     Company, provided that (i) with respect to a Public Equity Offering
     referred to in clause (A) above, cash proceeds of such Public Equity
     Offering in an amount sufficient to effect the redemption of Securities to
     be so redeemed are contributed by the Guarantor to the Company prior to
     such redemption and used by the Company to effect such redemption and
     (ii) such redemption occurs within 180 days after consummation of such
     Public Equity Offering.

     6.   Notice of Redemption.
          --------------------

               Notice of any optional redemption will be mailed at least 30 days
     but not more than 60 days before the Redemption Date to each Holder of
     Notes to be redeemed at his last address as it appears in the Security
     Register.  Notes in original denominations larger than $1,000 may be
     redeemed in part.  On and after the Redemption Date, interest ceases to
     accrue on Notes or portions of Notes called for redemption, unless the
     Company defaults in the payment of the Redemption Price.

     7.   Repurchase upon Change in Control.
          ---------------------------------

               Upon the occurrence of any Change of Control, each Holder shall
     have the right to require the repurchase of its Notes by the Company in
     cash pursuant to the offer described in the Indenture at a purchase price
     equal to 101% of the Accreted Value thereof plus accrued and unpaid
     interest, if any, to the date of purchase (the "Change of Control
     Payment").

               A notice of such Change of Control will be mailed within 30 days
     after any Change of Control occurs to each Holder at his last address as it
     appears in the Security Register.  Notes in original denominations larger
     than $1,000 may be sold to the Company in part.  On and after the date of
     the Change of Control Payment, interest ceases to accrue on Notes or
     portions of Notes surrendered for purchase by the Company, unless the
     Company defaults in the payment of the Change of Control Payment.

     8.   Denominations; Transfer; Exchange.
          ---------------------------------

               The Notes are in registered form without coupons in denominations
     of $1,000 of principal amount at maturity and multiples of $1,000 in excess
     thereof.  A Holder may register the transfer or exchange of Notes in
     accordance with the Indenture.  The Registrar may require a Holder, among
     other things, to furnish appropriate endorsements and transfer documents
     and to pay any taxes and fees required by law or permitted by the
     Indenture.  The Registrar need not register the transfer or exchange of any
     Notes selected for redemption.  Also, it need not register the transfer or
     exchange of any Notes for a period of 15 days before a selection of Notes
     to be redeemed is made.

     9.   Persons Deemed Owners.
          ---------------------

               A Holder shall be treated as the owner of a Note for all
     purposes.

     10.  Unclaimed Money.
          ---------------

               If money for the payment of principal, premium, if any, or
     interest remains unclaimed for two years, the Trustee and the Paying Agent
     will pay the money back to the Company at its request.  After that, Holders
     entitled to the money must look to the Company for payment, unless an
     abandoned property law designates another Person, and all liability of the
     Trustee and such Paying Agent with respect to such money shall cease.

     11.  Discharge Prior to Redemption or Maturity.
          -----------------------------------------

               If the Company or the Guarantor deposits with the Trustee money
     or U.S. Government Obligations sufficient to pay the then outstanding
     principal of, premium, if any, and accrued interest on the Notes (a) to
     redemption or maturity, the Company will be discharged from the Indenture
     and the Notes, except in certain circumstances for certain sections
     thereof, and (b) to the Stated Maturity, the Company and the Guarantor will
     be discharged from certain covenants set forth in the Indenture.

     12.  Amendment; Supplement; Waiver.
          -----------------------------

               Subject to certain exceptions, the Indenture or the Notes may be
     amended or supplemented with the consent of the Holders of at least a
     majority in principal amount at maturity of the Notes then outstanding, and
     any existing default or compliance with any provision may be waived with
     the consent of the Holders of at least a majority in principal amount at
     maturity of the Notes then outstanding.  Without notice to or the consent
     of any Holder, the parties thereto may amend or supplement the Indenture or
     the Notes to, among other things, cure any ambiguity, defect or
     inconsistency and make any change that does not materially and adversely
     affect the rights of any Holder.

     13.  Restrictive Covenants.
          ---------------------

               The Indenture imposes certain limitations on the ability of the
     Company and the Guarantor and its Restricted Subsidiaries, among other
     things, to Incur Indebtedness, make Restricted Payments, use the proceeds
     from Asset Sales, engage in transactions with Affiliates or, with respect
     to each of the Company and the Guarantor, merge, consolidate or transfer
     substantially all of its assets.  Within 45 days after the end of each
     fiscal quarter (90 days after the end of the last fiscal quarter of each
     year), the Company must report to the Trustee on compliance with such
     limitations.

     14.  Successor Persons.
          -----------------

               When a successor person or other entity assumes all the
     obligations of its predecessor under the Notes and the Indenture, the
     predecessor person will be released from those obligations.

     15.  Defaults and Remedies.
          ---------------------

               The following events constitute "Events of Default" under the
     Indenture:  (a) default in the payment of principal of (or premium, if any,
     on) any Note when the same becomes due and payable at maturity, upon
     acceleration, redemption or otherwise; (b) default in the payment of
     interest on any Note when the same becomes due and payable, and such
     default continues for a period of 30 days; (c) the Company or the Guarantor
     defaults in the performance of or breaches any other covenant or agreement
     of the Company or the Guarantor in the Indenture or under the Notes and
     such default or breach continues for a period of 30 consecutive days after
     written notice by the Trustee or the Holders of 25% or more in aggregate
     principal amount at maturity of the Notes; (d) there occurs with respect to
     any issue or issues of Indebtedness of the Company, the Guarantor or any
     Significant Subsidiary having an outstanding principal amount at maturity
     of $10 million or more in the aggregate for all such issues of all such
     Persons, whether such Indebtedness now exists or shall hereafter be
     created, (I) an event of default that has caused the holder thereof to
     declare such Indebtedness to be due and payable prior to its Stated
     Maturity and such Indebtedness has not been discharged in full or such
     acceleration has not been rescinded or annulled within 30 days of such
     acceleration and/or (II) the failure to make a principal payment at the
     final (but not any interim) fixed maturity and such defaulted payment shall
     not have been made, waived or extended within 30 days of such payment
     default; (e) any final judgment or order (not covered by insurance) for the
     payment of money in excess of $10 million in the aggregate for all such
     final judgments or orders against all such Persons (treating any
     deductibles, self-insurance or retention as not so covered) shall be
     rendered against the Company, the Guarantor or any Significant Subsidiary
     and shall not be paid or discharged, and there shall be any period of 30
     consecutive days following entry of the final judgment or order that causes
     the aggregate amount for all such final judgments or orders outstanding and
     not paid or discharged against all such Persons to exceed $10 million
     during which a stay of enforcement of such final judgment or order, by
     reason of a pending appeal or otherwise, shall not be in effect; (f) a
     court having jurisdiction in the premises enters a decree or order for (A)
     relief in respect of the Company, the Guarantor or any Significant
     Subsidiary in an involuntary case under any applicable bankruptcy,
     insolvency or other similar law now or hereafter in effect, (B) appointment
     of a receiver, liquidator, assignee, custodian, trustee, sequestrator or
     similar official of the Company, the Guarantor or any Significant
     Subsidiary or for all or substantially all of the property and assets of
     the Company, the Guarantor or any Significant Subsidiary or (C) the winding
     up or liquidation of the affairs of the Company, the Guarantor or any
     Significant Subsidiary and, in each case, such decree or order shall remain
     unstayed and in effect for a period of 30 consecutive days; or (g) the
     Company, the Guarantor or any Significant Subsidiary (A) commences a
     voluntary case under any applicable bankruptcy, insolvency or other similar
     law now or hereafter in effect, or consents to the entry of an order for
     relief in an involuntary case under any such law, (B) consents to the
     appointment of or taking possession by a receiver, liquidator, assignee,
     custodian, trustee, sequestrator or similar official of the Company, the
     Guarantor or any Significant Subsidiary or for all or substantially all of
     the property and assets of the Company, the Guarantor or any Significant
     Subsidiary or (C) effects any general assignment for the benefit of
     creditors.  

               If an Event of Default (other than an Event of Default specified
     in clause (f) or (g) above that occurs with respect to the Company or the
     Guarantor) occurs and is continuing under the Indenture, the Trustee or the
     Holders of at least 25% in aggregate principal amount at maturity of the
     Notes, then outstanding, by written notice to the Company (and to the
     Trustee if such notice is given by the Holders), may, and the Trustee at
     the request of such Holders shall, declare the Accreted Value of, premium,
     if any, and accrued interest, if any, on the Notes to be immediately due
     and payable.

               If an Event of Default, as defined in the Indenture, occurs and
     is continuing, the Trustee or the Holders of at least 25% in principal
     amount at maturity of the Notes may declare all the Notes to be due and
     payable.  If a bankruptcy or insolvency default with respect to the Company
     or any Restricted Subsidiary occurs and is continuing, the Notes
     automatically become due and payable.  Holders may not enforce the
     Indenture or the Notes except as provided in the Indenture.  The Trustee
     may require indemnity satisfactory to it before it enforces the Indenture
     or the Notes.  Subject to certain limitations, Holders of at least a
     majority in principal amount at maturity of the Notes then outstanding may
     direct the Trustee in its exercise of any trust or power.

     16.  Guarantee.
          ---------

               The Company's obligations under the Notes are fully and
     irrevocably guaranteed by the Guarantor.

     17.  Trustee Dealings with Company or Guarantor.
         ------------------------------------------

               The Trustee under the Indenture, in its individual or any other
     capacity, may make loans to, accept deposits from and perform services for
     the Company, the Guarantor or their Affiliates and may otherwise deal with
     the Company, the Guarantor or their Affiliates as if it were not the
     Trustee.

     18.  No Recourse Against Others.
          --------------------------

               No incorporator or any past, present or future partner,
     shareholder, other
     equity holder, officer, director, employee or controlling person as such,
     of the Company or the Guarantor or of any successor Person shall have any
     liability for any obligations of the Company or the Guarantor under the
     Notes or the Indenture or for any claim based on, in respect of or by
     reason of, such obligations or their creation.  Each Holder by accepting a
     Note waives and releases all such liability.  The waiver and release are
     part of the consideration for the issuance of the Notes.

     19.  Authentication.
          --------------

               This Note shall not be valid until the Trustee or authenticating
     agent signs the certificate of authentication on the other side of this
     Note.

     20.  Abbreviations.
          -------------

               Customary abbreviations may be used in the name of a Holder or an
     assignee, such as:  TEN COM (= tenants in common), TEN ENT (= tenants by
     the entireties), JT TEN (= joint tenants with right of survivorship and not
     as tenants in common), CUST (= Custodian) and U/G/M/A (= Uniform Gifts to
     Minors Act).

               The Company will furnish to any Holder upon written request and
     without charge a copy of the Indenture.  Requests may be made to ICG
     Holdings, Inc., 9605 East Maroon Circle, P.O. Box 6742, Englewood,
     Colorado, 80155-6742, Attention:  Chief Financial Officer.


                              [FORM OF TRANSFER NOTICE]


               FOR VALUE RECEIVED the undersigned registered holder hereby
     sell(s), assign(s) and transfer(s) unto

     Insert Taxpayer Identification No.
     ----------------------------------

                                                                                
     -----------------------------------------------------------------------
                                      
     ---------------------------------

     Please print or typewrite name and address including zip code of assignee
                                                                                
     ---------------------------------------------------------------------------
                                        
     -----------------------------------

     the within Note and all rights thereunder, hereby irrevocably constituting
     and appointing                                                             
                    ----------------------------------------------------------
             attorney to transfer said Note on the books of the Company with 
     -------
     full power of substitution in the premises.


                       [THE FOLLOWING PROVISION TO BE INCLUDED
                  ON ALL SECURITIES OTHER THAN EXCHANGE SECURITIES,
                      UNLEGENDED OFFSHORE GLOBAL SECURITIES AND
                       UNLEGENDED OFFSHORE PHYSICAL SECURITIES]

          In connection with any transfer of this Note occurring prior to the
     date which is the earlier of (i) the date of an effective Registration or
     (ii) the end of the period referred to in Rule 144(k) under the Securities
     Act, the undersigned confirms that without utilizing any general
     solicitation or general advertising that:

                                     [Check One]
                                      ---------

     [  ] (a)  this Note is being transferred in compliance with the exemption
               from registration under the Securities Act of 1933, as amended,
               provided by Rule 144A thereunder.

                                          or
                                          --

     [  ] (b)  this Note is being transferred other than in accordance with
               (a) above and documents are being furnished which comply with the
               conditions of transfer set forth in this Note and the Indenture.

     If none of the foregoing boxes is checked, the Trustee or other Registrar
     shall not be obligated to register this Note in the name of any Person
     other than the Holder hereof unless and until the conditions to any such
     transfer of registration set forth herein and in Section 2.08 of the
     Indenture shall have been satisfied.

     Date:
          ---------------------------------------------------------------------
                              NOTICE:  The signature to this assignment must
                              correspond with the name as written upon the face
                              of the within-mentioned instrument in every
                              particular, without alteration or any change
                              whatsoever.



     TO BE COMPLETED BY PURCHASER IF (a) ABOVE IS CHECKED.

          The undersigned represents and warrants that it is purchasing this
     Note for its own account or an account with respect to which it exercises
     sole investment discretion and that it and any such account is a "qualified
     institutional buyer" within the meaning of Rule 144A under the Securities
     Act of 1933, as amended, and is aware that the sale to it is being made in
     reliance on Rule 144A and acknowledges that it has received such
     information regarding the Company as the undersigned has requested pursuant
     to Rule 144A or has determined not to request such information and that it
     is aware that the transferor is relying upon the undersigned's foregoing
     representations in order to claim the exemption from registration provided
     by Rule 144A.

     Dated:
           --------------------------------------------------------------------
                                   NOTICE:  To be executed by an executive
                                   officer

     


                          OPTION OF HOLDER TO ELECT PURCHASE


               If you wish to have this Note purchased by the Company pursuant
     to Section 4.11 or Section 4.12 of the Indenture, check the Box:  [ ]

               If you wish to have a portion of this Note purchased by the
     Company pursuant to Section 4.11 or Section 4.12 of the Indenture, state
     the amount (in principal amount at maturity):  $                   .
                                                     -------------------

     Date:                      
            -----------------

     Your Signature:  
                    -----------------------------------------------------------
              (Sign exactly as your name appears on the other side of this Note)

     Signature Guarantee:  
                           ------------------------------