BETHESDA, Md. – April 12, 2011– OPNET Technologies, Inc. (Nasdaq:OPNT) will hold an investor conference call on Monday, May 9 at 5:00 pm Eastern Time to review FINANCIAL results for the fourth quarter of fiscal 2011.

To listen to the OPNET investor conference call:

• Call 877-377-7550 in the U.S. or 408-337-0151 for international callers, or
• Use the webcast link at www.opnet.com/news. Investors are advised to go to the web site at least 15 minutes early to register, download, and install any necessary audio software

To listen to the archived call:

• Call the replay phone number at 800-642-1687 or 706-645-9291 for international callers. For replay, enter passcode # 59512299. The replay will be available from 8:00 pm Eastern Time May 9, 2011 through 11:59 pm Eastern Time May 16, 2011.
• The webcast will be available at www.opnet.com/news. The webcast will be archived for seven days.

The fourth quarter of fiscal 2011 financial results will be released after the market closes on Monday, May 9, 2011.

About OPNET Technologies, Inc.

Founded in 1986, OPNET Technologies, Inc. (Nasdaq:OPNT) is a leading provider of solutions for application and network performance management. For more information about OPNET and its products, please visit www.opnet.com.

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