UNITED STATES
                       SECURITIES AND EXCHANGE COMMISSION
                             Washington, D.C. 20549

                                    FORM 8-K

                                 CURRENT REPORT
                       Pursuant to Section 13 or 15(d) of
                       The Securities Exchange Act of 1934

          Date of Report (Date of earliest event reported): May 3, 2006

                             NetScout Systems, Inc.
                             ----------------------
             (Exact Name of Registrant as Specified in its Charter)

                                    Delaware
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                 (State or Other Jurisdiction of Incorporation)

                   0000-26251                           04-2837575
         -----------------------------       -----------------------------------
            (Commission File Number)          (IRS Employer Identification No.)


            310 Littleton Road, Westford, Massachusetts             01886
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             (Address of Principal Executive Offices)             (Zip Code)


                                 (978) 614-4000
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              (Registrant's Telephone Number, Including Area Code)


                                 Not Applicable
          -------------------------------------------------------------
          (Former Name or Former Address, If Changed Since Last Report)

Check the appropriate box below if the Form 8-K filing is intended to
simultaneously satisfy the filing obligation of the registrant under any of the
following provisions:

[ ] Written communications pursuant to Rule 425 under the Securities Act (17 CFR
    230.425)

[ ] Soliciting material pursuant to Rule 14a-12 under the Exchange Act (17 CFR
    240.14a-12)

[ ] Pre-commencement communications pursuant to Rule 14d-2(b) under the Exchange
    Act (17 CFR 240.14d-2(b))

[ ] Pre-commencement communications pursuant to Rule 13e-4(c) under the Exchange
    Act (17 CFR 240.13e-4(c))






ITEM 2.02. RESULTS OF OPERATIONS AND FINANCIAL CONDITION.

The following information and the Exhibit attached hereto shall not be deemed
"filed" for purposes of Section 18 of the Securities Exchange Act of 1934, as
amended (the "Exchange Act") or otherwise subject to the liabilities of that
section, nor shall it be deemed incorporated by reference in any filing under
the Securities Act of 1933, as amended, or the Exchange Act, except as expressly
set forth by specific reference in such filing.

On May 3, 2006, NetScout Systems, Inc. (the "Company") issued a press release
regarding its financial results for the quarter and year ended March 31, 2006,
its expectations of future performance and its intention to hold a conference
call regarding these topics. The Company's press release is furnished as Exhibit
99.1 to this report and is incorporated herein by reference.


ITEM 9.01. FINANCIAL STATEMENTS AND EXHIBITS.

(d) Exhibits.

The Company hereby furnishes the following exhibit:

99.1  Press release dated May 3, 2006.






                                   SIGNATURES

Pursuant to the requirements of the Securities Exchange Act of 1934, the
Registrant has duly caused this report to be signed on its behalf by the
undersigned thereunto duly authorized.


                                         NETSCOUT SYSTEMS, INC.


                                             By:  /s/ David P. Sommers
                                                  ------------------------------
                                                  David P. Sommers
                                                  Chief Financial Officer and
                                                  Senior Vice President, General
                                                  Operations



             Date: May 3, 2006






                                  EXHIBIT INDEX


       Exhibit  Number         Description
       ---------------         -------------------------------------------------
       99.1                    Press release dated May 3, 2006.