<PAGE>


  AS FILED WITH THE SECURITIES AND EXCHANGE COMMISSION ON MARCH 9, 2000
                                                     REGISTRATION NO. 333-93545

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                      SECURITIES AND EXCHANGE COMMISSION
                             WASHINGTON, DC 20549
                                ---------------

                             AMENDMENT NO. 6
                                      TO
                                   FORM S-1
                            REGISTRATION STATEMENT
                                     UNDER
                          THE SECURITIES ACT OF 1933
                                ---------------
                               NETPLIANCE, INC.
            (EXACT NAME OF REGISTRANT AS SPECIFIED IN ITS CHARTER)
     DELAWARE                     7370                  77-0463167
_______________________    ___________________    _______________________
  (STATE OR OTHER           (PRIMARY STANDARD        (I.R.S. EMPLOYER
  JURISDICTION OF              INDUSTRIAL         IDENTIFICATION NUMBER)
 INCORPORATION OR            CLASSIFICATION
   ORGANIZATION)              CODE NUMBER)
                     7600A NORTH CAPITAL OF TEXAS HIGHWAY
                              AUSTIN, TEXAS 78731
                                (512) 493-8300
  (ADDRESS, INCLUDING ZIP CODE, AND TELEPHONE NUMBER, INCLUDING AREA CODE, OF
                   REGISTRANT'S PRINCIPAL EXECUTIVE OFFICES)
                                ---------------
                                JAMES E. CAHILL
                      VICE PRESIDENT AND GENERAL COUNSEL
                               NETPLIANCE, INC.
                     7600A NORTH CAPITAL OF TEXAS HIGHWAY
                              AUSTIN, TEXAS 78731
                                (512) 493-8300
(NAME, ADDRESS, INCLUDING ZIP CODE, AND TELEPHONE NUMBER, INCLUDING AREA CODE,
                             OF AGENT FOR SERVICE)
                                ---------------
                                  Copies to:
     ROSS CLAYTON MULFORD                      PAUL R. TOBIAS
       J. WILLIAM WILSON                  WILSON SONSINI GOODRICH &
     HUGHES & LUCE, L.L.P.                         ROSATI
111 CONGRESS AVENUE, SUITE 900          8911 CAPITAL OF TEXAS HIGHWAY
      AUSTIN, TEXAS 78701                    AUSTIN, TEXAS 78759
        (512) 482-6800                         (512) 338-5400
       APPROXIMATE DATE OF COMMENCEMENT OF PROPOSED SALE TO THE PUBLIC:
     As soon as practicable after the effective date of this Registration
                                  Statement.
   If any of the securities being registered on this Form are to be offered on
a delayed or continuous basis pursuant to Rule 145 under the Securities Act of
1933, check the following box. [_]

   If this Form is filed to register additional securities for an offering
pursuant to Rule 462(b) under the Securities Act, please check the following
box and list the Securities Act registration number of the earlier effective
registration statement for the same offering. [_]

   If this Form is a post-effective amendment filed pursuant to Rule 462(c)
under the Securities Act, check the following box and list the Securities Act
registration number of the earlier effective registration statement for the
same offering. [_]

   If this Form is a post-effective amendment filed pursuant to Rule 462(d)
under the Securities Act, check the following box and list the Securities Act
registration statement number of the earlier effective registration statement
for the same offering. [_]

   If delivery of the prospectus is expected to be made pursuant to Rule 434,
please check the following box. [_]
   The Registrant hereby amends this Registration Statement on such date or
dates as may be necessary to delay its effective date until the Registrant
shall file a further amendment which specifically states that this
Registration Statement shall thereafter become effective in accordance with
Section 8(a) of the Securities Act of 1933, as amended, or until the
Registration Statement shall become effective on such date as the Securities
and Exchange Commission, acting pursuant to such Section 8(a), may determine.

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<PAGE>

                                EXPLANATORY NOTE

   The purpose of this Amendment No. 6 to the Registration Statement is solely
to amend Exhibits 10.1 and 10.2 to the Registration Statement, as set forth
below in Item 16(a) of Part II.

                                    PART II

                     INFORMATION NOT REQUIRED IN PROSPECTUS

ITEM 13. OTHER EXPENSES OF ISSUANCE AND DISTRIBUTION.

   The following table sets forth the expenses to be incurred by the Registrant
in connection with the issuance and distribution of the securities being
registered.

<TABLE>
      <S>                                                             <C>
      Securities and Exchange Commission Registration Fee............ $   26,400
      National Association of Securities Dealers, Inc. Filing Fee....     12,575
      Printing and Mailing Expenses..................................    240,000
      Accounting Fees and Expenses...................................    225,000
      Legal Fees and Expenses........................................    450,000
      Blue Sky Fees and Expenses.....................................      5,000
      Registrar and Transfer Agent Fees..............................     10,000
      Miscellaneous Expenses.........................................     31,025
                                                                      ----------
      Total.......................................................... $1,000,000
                                                                      ==========
</TABLE>
---------------------
* To follow.

   All of the above fees and expenses, except the Securities and Exchange
Commission registration fee and the National Association of Securities Dealers,
Inc. filing fee, represent estimates only.

ITEM 14. INDEMNIFICATION OF DIRECTORS AND OFFICERS

   Section 145 of the General Corporation Law of the State of Delaware (the
"DGCL") provides that a corporation may indemnify any person, including any
officer or director, who is, or is threatened to be made, party to any
threatened, pending or completed legal action, suit or proceeding, whether
civil, criminal, administrative or investigative (other than an action by or in
the right of such corporation), by reason of the fact that such person was an
officer, director, employee or agent of such corporation, or is or was serving
at the request of such corporation as a director, officer, employee or agent of
another corporation. The indemnity may include expenses (including attorneys'
fees), judgments, fines and amounts paid in settlement actually and reasonably
incurred by such person in connection with such action, suit or proceeding,
provided such officer, director, employee or agent acted in good faith and in a
manner he reasonably believed to be in or not opposed to the corporation's best
interests and, for criminal proceedings, had no reasonable cause to believe
that his conduct was unlawful. A Delaware corporation may indemnify officers
and directors in an action by or in the right of the corporation under the same
conditions, except that no indemnification is permitted without judicial
approval if the officer or director is adjudged to be liable to the
corporation. Where an officer or director is successful on the merits or
otherwise in the defense of any action referred to above, the corporation must
indemnify him against the expenses which such officer or director actually and
reasonably incurred.

   The Certificate of Incorporation of the Registrant provides that no director
of the Registrant will be personally liable to the Company or its stockholders
for monetary damages for breach of fiduciary duty as a director, except to the
extent such exemption from liability or limitation thereof is not permitted
under the DGCL as currently in effect or as the same may hereafter be amended.
Pursuant to Section 102(b)(7) of the DGCL the Certificate of Incorporation of
the Registrant eliminates such liability, except for liabilities related to
breach of duty of loyalty, actions not in good faith and certain other
liabilities.

   The Registrant has a directors' and officers' liability insurance policy.
The Bylaws of the Registrant provide for indemnification of the officers and
directors of the Company to the fullest extent permitted by the applicable law.
In addition, the Company will enter into an indemnification agreement with each
of its

                                      II-1
<PAGE>

directors, pursuant to which they will be entitled to advances for the costs of
defending actions against them in addition to that provided by the
indemnification provisions in the Certificate of Incorporation or the Company's
officers' and directors' insurance policy.

   The form of Underwriting Agreement attached hereto as Exhibit 1.1, which
provides for, among other things, the Registrant's sale to the Underwriters of
the securities being registered herein, will obligate the Underwriters to
indemnify the Registrant and Registrant's officers and directors against
certain liabilities under the Securities Act of 1933.

ITEM 15. RECENT SALES OF UNREGISTERED SECURITIES

   Since our formation, we have issued and sold the following securities (as
adjusted for a three-for-one stock split effective immediately prior to the
effectiveness of this Registration Statement).

   (a) In January 1999, we issued 3,000 shares of common stock at $0.17 per
share in order to initially capitalize the Registrant as required by state law.

   (b) Also in January 1999, we issued 14,400,000 shares of common stock at
$0.02 per share, for an aggregate purchase price of $240,000, to our founders.
3,981,060 of these shares were subsequently redeemed and reissued to investors
in April 1999 as described in (d) below.

   (c) Also in January 1999, we issued an aggregate of 350,000 shares of Series
A preferred stock at $5.71 per share for an aggregate purchase price of
$2,000,000 to one of our founders.

   (d) From February 1999 through April 1999, we issued an aggregate of
4,431,066 shares of Common Stock at $0.19 per share for an aggregate purchase
price of $841,902 to 21 investors.

   (e) In May and July 1999, we issued an aggregate of 185,714 shares of Series
A preferred stock at $42.00 per share for an aggregate purchase price of
$7,800,000 to one of our founders.

   (f) In July 1999, we issued 120,000 shares of common stock at $1.19 per
share for an aggregate purchase price of $142,800 to one investor in connection
with his employment with us.

   (g) In July and August 1999, we issued an aggregate of 3,526,065 shares of
common stock at $1.40 per share for an aggregate purchase price of $4,936,491
to 24 investors.

   (h) In September 1999, we issued 122,933 shares of Series A preferred stock
at $60.00 per share for an aggregate purchase price of $7,375,980 to 30
investors.

   (i) In October 1999, we issued 116,666 shares of Series B preferred stock at
$60.00 per share for an aggregate purchase price of $7,000,000 to one investor
and entered into an agreement to put, prior to December 31, 1999, 66,668 shares
of Series C preferred stock at $90.00 per share to that investor and one of our
founders. We also issued 90,000 shares of common stock to the director
nominated by the Series B preferred stock purchaser at a purchase price of
$1.70 per share in October 1999.

   (j) In November 1999, we issued 300,000 shares of common stock at $1.70 for
an aggregate purchase price of $510,000 to one investor in connection with his
employment with us.

   (k) In December 1999, we issued an aggregate of 66,668 shares of Series C
preferred stock to the investor in Series B preferred stock and one of our
founders pursuant to the October agreement, at $90.00 per share, for an
aggregate purchase price of $6,000,000.

   (l) On December 22, 1999, we entered into irrevocable commitments to sell an
aggregate of 1,430,000 shares of Series D preferred stock for an aggregate
purchase price of $28,600,000 to eight investors and granted a warrant to
purchase 600,000 shares of our common stock to one of those investors. In
January 2000, we issued the 1,430,000 shares of Series D preferred stock.

   (m) On February 7, 2000, we issued 1,127,675 shares of our Series E
preferred stock for an aggregate purchase price of $33,830,250 to four
investors. The issuance of 933,334 shares of Series E preferred stock was
exempt from the registration requirements of the Securities Act by virtue of
Regulation S promulgated thereunder.

                                      II-2
<PAGE>

   From our inception to February 24, 2000, we granted options to purchase an
aggregate of 8,303,445 shares of common stock to our directors, executive
officers, employees and consultants pursuant to our stock option plan. To date
we have issued 57,375 shares of our common stock upon exercise of outstanding
options.

   None of the foregoing transactions involved any public offering, and we
believe that each transaction was exempt from the registration requirements of
the Securities Act by virtue of Section 4(2) thereof, Regulation D promulgated
thereunder or Rule 701 pursuant to compensatory benefit plans and contracts
relating to compensation as provided under such Rule 701. The recipients in
each such transaction represented their intention to acquire the securities for
investment only and not with a view to or for sale in connection with any
distribution thereof, and appropriate legends were affixed to the share
certificates and instruments issued in such transactions. All recipients had
adequate access, through their relationships with us, to information about
Netpliance, Inc.

ITEM 16. EXHIBITS AND FINANCIAL STATEMENT SCHEDULES

   (a) Exhibits

<TABLE>
 <C>    <C>   <S>
   1.1    **  Form of Underwriting Agreement among Netpliance and the
              Underwriters.

   3.1    **  Certificate of Incorporation of Netpliance.

   3.2    **  Bylaws of Netpliance.

   4.1    **  Specimen Certificate for Common Stock.

   4.2    **  Amended and Restated Rights Agreement among Netpliance and
              Watershed Capital L.L.P. and John F. McHale dated as of December
              3, 1999.

   4.3    **  Amended and Restated Series D and Series E Rights Agreement among
              Netpliance and the purchasers of Series D and Series E preferred
              stock dated February 7, 2000.

   5        * Opinion of Hughes & Luce, L.L.P. as to the validity of the shares
              of Common Stock of Netpliance being registered.

  10.1  +     Internetworking Agreement by and between GTE Internetworking
              Incorporated and Netpliance dated as of May 30, 1999, as amended.

  10.2  +     OEM Purchase Agreement by and between Netpliance and Quanta
              Computer dated as of August 15, 1999.

  10.3    **  Sublease Agreement by and between Netpliance and Powershift
              Venures, L.L.C. dated June 15, 1999.

  10.4    **  Office Lease by and between Netpliance and SV Bull Creek Limited
              Partnership dated February 16, 2000.

  10.5    **  Netpliance's Amended and Restated 1999 Stock Option and
              Restricted Stock Plan.

  10.6    **  Netpliance's Employee Stock Purchase Plan.

  10.7    **  Employment Agreement by and between Netpliance and Kent A. Savage
              dated February 1, 1999.

  10.8    **  Employment Agreement by and between Netpliance and Kenneth A.
              Kalinoski dated February 1, 1999.

  10.9    **  Form of Indemnity Agreement between Netpliance and its Directors
              and Officers.

  10.10   **  Voting Agreement among Netpliance, U S WEST Internet Ventures,
              Inc., John F. McHale and Kent A. Savage dated December 22, 1999.

  21          There are no principal subsidiaries of Netpliance, Inc.

  23.1    **  Consent of KPMG LLP.

  23.2      * Consent of Hughes & Luce, L.L.P.
  23.3    **  Consent of International Data Corporation.
  24.1    **  Power of Attorney (included in this Registration Statement).

  24.2    **  Power of Attorney of Joseph R. Zell.

  27.1    **  Financial Data Schedule.
</TABLE>

                                      II-3
<PAGE>

---------------------
 * To be filed by amendment.
** Previously filed

 + Portions of this exhibit have been omitted pursuant to a request for
   confidential treatment. The omitted information has been filed separately
   with the Securities Exchange Commission.
(b) Financial Statements filed as part of this Registration Statement are
    listed in the Index to Financial Statements on page F-1.

Item 17. Undertakings

   (a) The Registrant hereby undertakes to provide to the underwriters at the
closing specified in the Underwriting Agreement certificates in such
denominations and registered in such names as required by the underwriters to
permit prompt delivery to each purchaser.

   (b) Insofar as indemnification for liabilities arising under the Securities
Act of 1933 may be permitted to directors, officers and controlling persons of
the Registrant pursuant to the provisions described under Item 14 or otherwise,
the Registrant has been advised that in the opinion of the Securities and
Exchange Commission such indemnification is against public policy as expressed
in the Act and is, therefore, unenforceable. In the event that a claim for
indemnification against such liabilities (other than the payment by the
Registrant of expenses incurred or paid by a director, officer or controlling
person of the Registrant in the successful defense of action, suit or
proceeding) is asserted by such director, officer or controlling person in
connection with the securities being registered, the Registrant will, unless in
the opinion of its counsel the matter has been settled by controlling
precedent, submit to a court of appropriate jurisdiction the question whether
such indemnification by it is against public policy as expressed in the Act and
will be governed by the final adjudication of such issue.

   (c) The undersigned Registrant hereby undertakes that:

     (1) for the purposes of determining any liability under the Securities
  Act of 1933, the information omitted from the form of prospectus filed as
  part of this registration statement in reliance upon Rule 430A and
  contained in a form of prospectus filed by the Registrant pursuant to Rule
  424(b)(1) or (4) or 497(h) under the Securities Act shall be deemed to be
  part of this registration statement as of the time it was declared
  effective.

     (2) for the purpose of determining any liability under the Securities
  Act of 1933, each post-effective amendment that contains a form of
  prospectus shall be deemed to be a new registration statement relating to
  the securities offered therein, and the offering of such securities at that
  time shall be deemed to be the initial bona fide offering thereof.

                                      II-4
<PAGE>

                                   SIGNATURES

   Pursuant to the requirements of the Securities Act of 1933, the registrant
has duly caused this Registration Statement to be signed on its behalf by the
undersigned, thereunto duly authorized, in the City of Austin, State of Texas,
on March 9, 2000.

                                          NETPLIANCE, INC.



                                                    /s/ Kent A. Savage
                                          By: _________________________________
                                                     Kent A. Savage
                                              President and Chief Executive
                                                         Officer

                                                 /s/ Barbara A. Kaczynski
                                          By: _________________________________
                                                  Barbara A. Kaczynski
                                                 Chief Financial Officer

                               POWER OF ATTORNEY

   Pursuant to the requirements of the Securities Act of 1933, this
Registration Statement has been signed below by the following persons in the
capacities and on the date(s) indicated.

<TABLE>
<CAPTION>
             SIGNATURE                           TITLE                    DATE
             ---------                           -----                    ----

<S>                                  <C>                           <C>
                 *                   Chairman of the Board           March 9, 2000
____________________________________
           John F. McHale

         /s/ Kent A. Savage          President and Chief             March 9, 2000
____________________________________ Executive Officer and
           Kent A. Savage            Director (Principal
                                     Executive Officer)

      /s/ Barbara A. Kaczynski       Chief Financial Officer         March 9, 2000
____________________________________ (Principal Financial
        Barbara A. Kaczynski         Officer)

        /s/ M. David Hampton         Treasurer and Controller        March 9, 2000
____________________________________ (Principal Accounting
          M. David Hampton           Officer)

                 *                   Director and Secretary          March 9, 2000
____________________________________
            Paul S. Zito

                 *                   Director                        March 9, 2000
____________________________________
         Michael R. Corboy
</TABLE>

                                      II-5
<PAGE>

<TABLE>
<CAPTION>
             SIGNATURE                           TITLE                    DATE
             ---------                           -----                    ----

<S>                                  <C>                           <C>
                 *                   Director                        March 9, 2000
____________________________________
          David S. Lundeen

                 *                   Director                        March 9, 2000
____________________________________
          James M. Mansour

                 *                   Director                        March 9, 2000
____________________________________
       Steven G. Papermaster

                 *                   Director                        March 9, 2000
____________________________________
           Kevin Denuccio

                 *                   Director                        March 9, 2000
____________________________________
           Joseph R. Zell

                 *                   Director                        March 9, 2000
____________________________________
           Grant A. Dove
</TABLE>

      /s/ Kent A. Savage
* By __________________________
        Kent A. Savage
       Attorney-in-Fact
 Pursuant to Power of Attorney


                                      II-6
<PAGE>

                                 Exhibit Index

<TABLE>
<CAPTION>
 Exhibit
  Number
 <C>      <S>
  1.1  ** Form of Underwriting Agreement among Netpliance and the Underwriters.

  3.1  ** Certificate of Incorporation of the Company.

  3.2  ** Bylaws of the Company.

  4.1  ** Specimen Certificate for Common Stock.

  4.2  ** Amended and Restated Rights Agreement among Netpliance and Watershed
          Capital L.L.P. and John F. McHale dated as of December 3, 1999.
          (Previously filed as exhibit 10.6)

  4.3  ** Amended and Restated Series D and Series E Rights Agreement among
          Netpliance and the purchasers of Series D and Series E preferred
          stock dated February 7, 2000.

   5    * Opinion of Hughes & Luce, L.L.P. as to the validity of the shares of
          Common Stock of the Company being registered.

 10.1  +  Internetworking Agreement by and between GTE Internetworking
          Incorporated and Netpliance dated as of May 30, 1999.

 10.2  +  OEM Purchase Agreement by and between Netpliance and Quanta Computer
          dated as of August 15, 1999.

 10.3  ** Sublease Agreement by and between Netpliance and Powershift Ventures,
          L.L.C. dated June 15, 1999.

 10.4  ** Office Lease by and between Netpliance and SV Bull Creek Limited
          Partnership dated February 16, 2000.

 10.5  ** Netpliance's Amended and Restated 1999 Stock Option and Restricted
          Stock Plan.

 10.6  ** Netpliance's Employee Stock Purchase Plan.

 10.7  ** Employment Agreement by and between Netpliance and Kent A. Savage
          dated February 1, 1999.

 10.8  ** Employment Agreement by and between Netpliance and Kenneth A.
          Kalinoski dated February 1, 1999.

 10.9  ** Form of Indemnity Agreement between Netpliance and its Directors and
          Officers.

 10.10 ** Voting Agreement among Netpliance, U S WEST Internet Ventures, Inc.,
          John F. McHale and Kent A. Savage dated December 22, 1999.

 21       There are no principal subsidiaries of Netpliance, Inc.

 23.1  ** Consent of KPMG LLP.

 23.2  *  Consent of Hughes & Luce, L.L.P. (included in the opinion filed
          herewith as Exhibit 5).
 23.3  ** Consent of International Data Corporation.

 24.1  ** Power of Attorney (included in this Registration Statement).

 24.2  ** Power of Attorney of Joseph R. Zell.

 27.1  ** Financial Data Schedule.
</TABLE>
---------------------
 * To be filed by amendment.
** Previously filed.

 + Portions of this exhibit have been omitted pursuant to a request for
   confidential treatment. The omitted information has been filed separately
   with the Securities Exchange Commission.