OPNET Technologies, Inc. Schedules First Quarter Results Earnings Teleconference & Webcast for Thursday, July 29, 2004

OPNET Technologies, Inc. (NASDAQ:OPNT) will hold an investor conference call on Thursday, July 29, 2004 at 5:00 pm Eastern Time to review financial results for the first quarter of fiscal 2005.

To listen to the OPNET investor conference call 877-407-9205 in the U.S. or 201-689-8054 for international callers, or use the webcast at www.opnet.com,. Investors are advised to go to the web site at least 15 minutes early to register, download, and install any necessary audio software.