Exhibit 21

SUBSIDIARIES OF NETSCOUT

Name	Jurisdiction of Incorporation
NetScout Systems Security Corporation	Massachusetts
NetScout Systems Canada Inc.	Ontario, Canada
NetScout Systems (UK) Limited	England and Wales
NetScout Service Level Corporation	Delaware
NetScout Systems France, SARL	France
NetScout Systems (HK) Limited	Hong Kong
NetScout Systems Mexico, S.A. de C.V.	Mexico
NetScout Systems Singapore Pte Ltd.	Singapore
NetScout Systems Norway AS	Norway
NetScout Systems India Pvt. Ltd.	India
NetScout Systems Switzerland GmbH	Switzerland
NetScout Systems Japan K.K.	Japan
NetScout Systems Germany GmbH	Germany
NetScout Systems Australia Pty Ltd.	Australia
Servicios A Terceros, S.C. Civil Society	Mexico