<PAGE>

                                                                    Exhibit 21

                           SUBSIDIARIES OF NETSCOUT
<TABLE>
<CAPTION>

NAME                                               JURISDICTION OF INCORPORATION

<S>                                                <C>
NetScout Systems Security Corporation                Massachusetts
NetScout Systems Canada Inc.                         Ontario, Canada
NetScout Systems Foreign Sales Corporation           Barbados
NetScout Systems (UK) Limited                        England and Wales
NetScout Service Level Corporation                   Delaware
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