NetScout Systems to Report First Quarter Fiscal Year 2010 Financial Results on July 23, 2009

WESTFORD, Mass.--(Business Wire)--
NetScout Systems, Inc. (NASDAQ: NTCT), today announced it would report its first
quarter fiscal year 2010 financial results on July 23, 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: 20002134. A replay of the call will
be available after 7:30 p.m. ET on July 23 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: 20002134.

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 market leader in Unified Service Delivery
Management enabling comprehensive end-to-end network and application assurance.
For nearly 25 years, NetScout has delivered breakthrough packet-flow technology
that provides trusted and comprehensive real-time network and application
performance intelligence enabling unified assurance of the network, applications
and users. These solutions enable IT staff to predict, preempt and resolve
network and service delivery problems while facilitating the optimization and
capacity planning of the network infrastructure. NetScout nGenius and Sniffer
solutions are deployed at more than 20,000 of the world`s largest enterprises,
government agencies, and service providers, to assure the network, applications
and service delivery to their users and customers. More information about
NetScout Systems is available at http://www.netscout.com.

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

Copyright Business Wire 2009