opnet
Press release

OPNET Launches Special Fundraising Effort for Victims of September 11th Terrorist Attacks

$25,000 Pledged by Bethesda Company & Its Employees, With All
Proceeds to Directly Aid Victims & Families

BETHESDA, MD., September 21, 2001 -- OPNET Technologies, Inc. (Nasdaq: OPNT), the leading provider of intelligent network management software, today announced a special fundraising effort to assist the victims and families of last week's terrorist attacks in Washington, D.C., New York City and Pennsylvania.

In urging company-wide participation, CEO Marc Cohen stated, "We are very fortunate that OPNET employees and their families remained safe throughout the tragic events of September 11th. This is a difficult time for many, and our support can make a difference."

The company and its staff have pledged approximately $25,000 in contributions to two funds: the September 11th Fund, sponsored by the New York Community Trust and the United Way of New York City; and, the American Red Cross Disaster Relief Fund.

About OPNET Technologies, Inc.
Founded in 1986, OPNET Technologies, Inc. is the leading provider of intelligent network management software. The OPNET product suite combines predictive modeling and a comprehensive understanding of networking technologies to enable its customers to more effectively design and deploy networks, provision services, diagnose network and application performance problems, and predict the impact of network changes. For more information about OPNET and its products, visit www.opnet.com.

Safe Harbour Statement
The statements contained in this press release that are not purely historical are forward-looking statements within the meaning the Private Securities Litigation Reform Act of 1995, as amended, including statements regarding OPNET Technologies Inc.'s expectations, beliefs, intentions, or strategies regarding the future. All forward-looking statements included in this document are based upon information available to OPNET Technologies, Inc. as of the date hereof; OPNET Technologies, Inc. assumes no obligation to update any such forward-looking statements. Forward-looking statements involve risks and uncertainties, which could cause actual results to differ materially from those projected. For a discussion of such risks and uncertainties, see the Company's reports filed with the Securities & Exchange Commission, including its 10-Q for the quarter ended June 30, 2001

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Note to editors: The word OPNET is spelled with all upper-case letters.

OPNET Media Contact:
Margarita Castillo
OPNET Technologies, Inc.
(240) 497-3000
Media@opnet.com
www.opnet.com

OPNET Investor Relations:
Mel Wesley
OPNET Technologies
(240) 497-3000
ir@opnet.com
www.opnet.com