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Proc-Type: 2001,MIC-CLEAR
Originator-Name: webmaster@www.sec.gov
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 TWSM7vrzLADbmYQaionwg5sDW3P6oaM5D3tdezXMm7z1T+B+twIDAQAB
MIC-Info: RSA-MD5,RSA,
 CDEvgTnAMVjbijYzWTXekt3JPQkuPLurbBs3Q9Gq5DCpY+YWeEtlDMZwc1dXkZs0
 Bpct/gr0yFFQ9tP6jZ4NqA==

<SEC-DOCUMENT>0001209191-03-033446.txt : 20031203
<SEC-HEADER>0001209191-03-033446.hdr.sgml : 20031203
<ACCEPTANCE-DATETIME>20031203162823
ACCESSION NUMBER:		0001209191-03-033446
CONFORMED SUBMISSION TYPE:	4
PUBLIC DOCUMENT COUNT:		1
CONFORMED PERIOD OF REPORT:	20031202
FILED AS OF DATE:		20031203

ISSUER:		

	COMPANY DATA:	
		COMPANY CONFORMED NAME:			NETSCOUT SYSTEMS INC
		CENTRAL INDEX KEY:			0001078075
		STANDARD INDUSTRIAL CLASSIFICATION:	SERVICES-COMPUTER INTEGRATED SYSTEMS DESIGN [7373]
		IRS NUMBER:				042837575
		STATE OF INCORPORATION:			DE
		FISCAL YEAR END:			0331

	BUSINESS ADDRESS:	
		STREET 1:		4 TECHNOLOGY PARK DR
		CITY:			WESTFORD
		STATE:			MA
		ZIP:			01886
		BUSINESS PHONE:		9786144000

	MAIL ADDRESS:	
		STREET 1:		4 TECHNOLOGY PARK DRIVE
		CITY:			WESTFORD
		STATE:			MA
		ZIP:			01886

REPORTING-OWNER:	

	OWNER DATA:	
		COMPANY CONFORMED NAME:			TA ASSOCIATES VIII LLC
		CENTRAL INDEX KEY:			0001235812
		STATE OF INCORPORATION:			DE
		FISCAL YEAR END:			1231

	FILING VALUES:
		FORM TYPE:		4
		SEC ACT:		1934 Act
		SEC FILE NUMBER:	000-26251
		FILM NUMBER:		031035577

	BUSINESS ADDRESS:	
		STREET 1:		125 HIGH STREET
		STREET 2:		SUITE 2500
		CITY:			BOSTON
		STATE:			MA
		ZIP:			02110
		BUSINESS PHONE:		6175746781

	MAIL ADDRESS:	
		STREET 1:		125 HIGH STREET
		STREET 2:		SUITE 2500
		CITY:			BOSTON
		STATE:			MA
		ZIP:			02110
</SEC-HEADER>
<DOCUMENT>
<TYPE>4
<SEQUENCE>1
<FILENAME>b48711vi.xml
<DESCRIPTION>MAIN DOCUMENT DESCRIPTION
<TEXT>
<XML>
<?xml version="1.0"?><ownershipDocument><schemaVersion>X0201</schemaVersion>    <documentType>4</documentType><periodOfReport>2003-12-02</periodOfReport><notSubjectToSection16>0</notSubjectToSection16><issuer><issuerCik>0001078075</issuerCik><issuerName>NETSCOUT SYSTEMS INC</issuerName>        <issuerTradingSymbol>NTCT</issuerTradingSymbol></issuer><reportingOwner><reportingOwnerId><rptOwnerCik>0001235812</rptOwnerCik><rptOwnerName>TA ASSOCIATES VIII LLC</rptOwnerName></reportingOwnerId><reportingOwnerAddress><rptOwnerStreet1>125 HIGH STREET</rptOwnerStreet1><rptOwnerStreet2>SUITE 2500</rptOwnerStreet2><rptOwnerCity>BOSTON</rptOwnerCity><rptOwnerState>MA</rptOwnerState><rptOwnerZipCode>02110</rptOwnerZipCode><rptOwnerStateDescription></rptOwnerStateDescription></reportingOwnerAddress><reportingOwnerRelationship><isDirector>0</isDirector><isOfficer>0</isOfficer><isTenPercentOwner>1</isTenPercentOwner><isOther>0</isOther></reportingOwnerRelationship></reportingOwner><nonDerivativeTable><nonDerivativeTransactio
n><securityTitle><value>Common Stock</value></securityTitle><transactionDate><value>2003-12-02</value></transactionDate><transactionCoding><transactionFormType>4</transactionFormType><transactionCode>S</transactionCode><equitySwapInvolved>0</equitySwapInvolved></transactionCoding><transactionAmounts><transactionShares><value>75991</value></transactionShares><transactionPricePerShare><value>8.30</value></transactionPricePerShare><transactionAcquiredDisposedCode><value>D</value></transactionAcquiredDisposedCode></transactionAmounts><postTransactionAmounts><sharesOwnedFollowingTransaction><value>3494985</value></sharesOwnedFollowingTransaction></postTransactionAmounts><ownershipNature><directOrIndirectOwnership><value>I</value><footnoteId id="F1" /></directOrIndirectOwnership><natureOfOwnership><value>See Footnote 1</value></natureOfOwnership></ownershipNature></nonDerivativeTransaction></nonDerivativeTable><footnotes><footnote id="F1">The reporting person may be deemed to have an indirect pecuniary interest as
 the General Partner of TA/Advent VIII L.P. The reporting person disclaims beneficial ownership of such shares because the reporting person's indirect pecuniary interest is subject to indeterminable future events.</footnote></footnotes><ownerSignature><signatureName>TA Associates VIII LLC</signatureName><signatureDate>2003-12-03</signatureDate></ownerSignature><ownerSignature><signatureName>By: TA Associates, Inc., its Manager</signatureName><signatureDate>2003-12-03</signatureDate></ownerSignature><ownerSignature><signatureName>By: Thomas P. Alber, Chief Financial Officer</signatureName><signatureDate>2003-12-03</signatureDate></ownerSignature></ownershipDocument>

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</TEXT>
</DOCUMENT>
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