Reminder: Please Join Us for the F5 Networks Conference Call.

SEATTLE -- F5 Networks (NASDAQ: FFIV):

			TOPIC:							F5 First Quarter Financial Results
			DATE:							Wednesday, January 19, 2011
			TIME:							1:30 p.m. Pacific (4:30 p.m. Eastern)
			DIAL IN NUMBER:							800-857-3834 (US & Canada)
										+1-210-839-8222 (International)
			CALL LEADER:							John McAdam
			PASSCODE:							F5 NETWORKS

Please call in 10 minutes ahead of time to ensure a proper connection. We look forward to having you join us. If you have any problems or questions, please call F5 NETWORKS, INC. (206) 272-5555.

REPLAY INFORMATION

Replay Via Phone:							Available January 19, 2011 (from 4:30 p.m. Pacific) through January 20, 2011 (until 11:59 p.m. Pacific)
							Phone: 800-934-9421 (US & Canada)
							+ 1-203-369-3391 (International)
Replay Via Internet:							http://www.f5.com/about/investor-relations/events-calendar.html
							Available until April 20, 2011