FINANCIAL RESULTS ON APRIL 30, 2009

WESTFORD, Mass., April 15, 2009 — NetScout Systems, Inc. (NASDAQ: NTCT), today announced it would report its fourth quarter and fiscal year end 2009 financial results on April 30, 2009 after the market close, and hold its corresponding conference call at 4:30 p.m. ET.

The numbers for the conference call are (866) 701-8242 (U.S.) and (763) 416-6912 (international).  The conference call ID is: 95490188.   A replay of the call will be available after 7:30 p.m. ET on April 30 for approximately one week.  The number for the replay is 800-642-1687 for U.S./Canada and 706-645-9291 for international callers.  The conference ID is: 95490188.

A live webcast of the conference call will be available on the company's website at http://www.netscout.com/investors. 

About NetScout Systems
NetScout Systems, Inc. is the industry leader in advanced network, application and service delivery management solutions. For over twenty years, NetScout has delivered breakthrough technology solutions that provide trusted, comprehensive real-time and historical performance intelligence, including advanced early warnings and rapid, definitive problem analysis. These capabilities have become vital, and increasingly strategic, to IT organizations. The world’s largest enterprises, government agencies, and service providers depend upon NetScout nGenius solutions to assure service delivery to their users by preventing disruptions and degradations. More information about NetScout Systems is available at http://www.netscout.com.

For further information, please contact:

Catherine Taylor
Director, Investor Relations
NetScout Systems, Inc.
Phone: 978-614-4286
E-mail: IR@netscout.com