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OPNET Extends International Presence to UK with Second International Office

Oxford, UK Site Selected by Leader in Intelligent Network Management Software to Support Growth in UK and Scandinavia

BETHESDA, MD -- August 6, 2001 -- OPNET Technologies, Inc. (Nasdaq: OPNT), the leading provider of intelligent network management software, today announced operations in the UK, based in Oxford, to offer customers in the UK and Scandinavia direct access to OPNET sales and technical resources.

The launch of the UK office follows the grand opening of OPNET's first European office, based in Paris, which began operations in November 2000. That office was established to serve the company's rapidly growing international client base -- including industry leaders Alcatel, British Telecom, DaimlerChrysler, Deutsche Telekom, Ericsson, France Telecom, Marconi, Nokia, Nortel, Philips, Telecom Italia, and Vodafone. In recent months, OPNET has forged agreements with a broad range of additional clients -- notably Cable & Wireless, Motorola, Barclays Bank and Hutchison 3G - which necessitated a presence in the UK.

"OPNET's market base includes network equipment manufacturers, enterprises, and service providers," noted Joe Lenz, OPNET Technologies' Vice President of International Sales. "As a result of our new 8.0 technology, which includes support for emerging technologies such as 3G wireless, our European opportunities have become increasingly large and complex. To fully meet customer requirements, we have invested in a facility to provide dedicated technical support, customer service, and sales."

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