OPNET Named One of Maryland's Fastest Growing Technology Companies in Deloitte's Technology Fast 50 Program.

BETHESDA, Md. -- OPNET Technologies, Inc. (NASDAQ:OPNT), a leading provider of management software for networks and applications, today announced that it has been named to Deloitte's prestigious Technology Fast 50 program for Maryland. The Technology Fast 50 Program for Maryland is a ranking of the 50 fastest growing technology, media, telecommunications and life sciences companies in Maryland by Deloitte & Touche USA LLP, one of the nation's leading professional services organizations. Rankings are based on the percentage revenue growth over five years from 2001-2005.

OPNET CEO, Marc A. Cohen, credits product innovation, sales force growth, and expansion of channel and strategic partnerships with the company's 96% revenue growth from 2001-2005. Marc Cohen stated, "We are honored to be included among the elite group of companies receiving this distinction from Deloitte. We've grown our team and our business by creating new technologies that focus on analytics. OPNET's solutions uniquely provide actionable analysis of the behavior of applications, networks, and systems. In the six years we have been a public company, our revenue has grown four-fold, we completed three acquisitions, and we entered into a global distribution agreement with Cisco Systems."

OPNET Technologies' increase in revenues of 96% from fiscal 2001 to fiscal 2005 resulted in a 37th ranking in the Technology Fast 50 for Maryland. To qualify for the Technology Fast 50, companies must have had operating revenues of at least $50,000 in 2001 and $5,000,000 in 2005, be headquartered in North America, and be a company that owns proprietary technology or proprietary intellectual property that contributes to a significant portion of the company's operating revenues; or devotes a significant proportion of revenues to the research and development of technology. Using other companies' technology or intellectual property in a unique way does not qualify.

"Deloitte's Maryland Technology Fast 50 companies have shown the strength, vision and tenacity to succeed in today's very competitive technology environment," said Mr. Andrew Harrs, Deloitte's Southeast TMT RIL Regional Managing Partner. "We applaud the successes of OPNET and acknowledge it as one of the very few to accomplish such a fast growth rate over the past five years."

The Maryland Technology Fast 50 program is presented by Deloitte and sponsored by Wilmer Cutler Pickering Hale and Dorr, NASDAQ and UK Trade & Investment, in association with media sponsors PR Newswire and Washington SmartCEO Magazine.

Winners of the 16 regional Technology Fast 50 programs in the United States and Canada are automatically entered in Deloitte's Technology Fast 500 program, which ranks North America's top 500 fastest growing technology, media, telecommunications and life sciences companies. For more information on Deloitte's Technology Fast 50 or Technology Fast 500 programs, visit www.fast500.com.

About OPNET Technologies, Inc.

Founded in 1986, OPNET Technologies, Inc. is a leading provider of management software for networks and applications. For more information about OPNET and its products, visit www.opnet.com.

About Deloitte

Deloitte refers to one or more of Deloitte Touche Tohmatsu, a Swiss Verein, its member firms and their respective subsidiaries and affiliates. As a Swiss Verein (association), neither Deloitte Touche Tohmatsu nor any of its member firms has any liability for each other's acts or omissions. Each of the member firms is a separate and independent legal entity operating under the names "Deloitte," "Deloitte & Touche," "Deloitte Touche Tohmatsu" or other related names. Services are provided by the member firms or their subsidiaries or affiliates and not by the Deloitte Touche Tohmatsu Verein.

Deloitte & Touche USA LLP is the U.S. member firm of Deloitte Touche Tohmatsu. In the U.S., services are provided by the subsidiaries of Deloitte & Touche USA LLP (Deloitte & Touche LLP, Deloitte Consulting LLP, Deloitte Financial Advisory Services LLP, Deloitte Tax LLP and their subsidiaries), and not by Deloitte & Touche USA LLP.

Copyright [c] 2006 Deloitte Development LLC. All rights reserved.

OPNET and OPNET Technologies, Inc. are trademarks of OPNET Technologies, Inc. All other trademarks are the property of their respective owners.

Statements in this press release that are not purely historical facts may constitute forward-looking statements as defined in the Private Securities Litigation Reform Act of 1995. OPNET Technologies, Inc. ("OPNET") assumes no obligation to update statements. Forward-looking statements are predictions based upon information available to OPNET as of the date of this press release and involve risks and uncertainties; therefore, actual events or results may differ materially. For a discussion of risk factors, see OPNET's reports, including its most recent 10-Q and 10-K, filed with the Securities & Exchange Commission.