About F5

FOR IMMEDIATE RELEASE

Please Join Us for the F5 Networks Conference Call

Seattle, June 08, 2012

MEDIA ALERT

F5 Networks, Inc. (NASDAQ: FFIV)

TOPIC: F5 Third Quarter Financial Results

DATE: Wednesday, July 18, 2012

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 questions, please call F5 NETWORKS, INC. (206) 272-5555.

REPLAY INFORMATION

REPLAY VIA PHONE: Phone: 866-454-9170 (US & Canada), + 1-203-369-1954 (International)
Available July 18, 2012 (from 4:30 p.m. Pacific) through July 19, 2012 (until 11:59 p.m. Pacific)

REPLAY VIA INTERNET: http://www.f5.com/about/investor-relations/events-calendar.html
Available until October 24, 2012

CONTACT: F5 Networks, Inc., Seattle. John Eldridge, 206-272-6571 (Investor Relations), j.eldridge@f5.com

About F5 Networks

F5 Networks, Inc., the global leader in Application Delivery Networking (ADN), helps the world’s largest enterprises and service providers realize the full value of virtualization, cloud computing, and on-demand IT. F5® solutions help integrate disparate technologies to provide greater control of the infrastructure, improve application delivery and data management, and give users seamless, secure, and accelerated access to applications from their corporate desktops and smart devices. An open architectural framework enables F5 customers to apply business policies at “strategic points of control” across the IT infrastructure and into the public cloud. F5 products give customers the agility they need to align IT with changing business conditions, deploy scalable solutions on demand, and manage mobile access to data and services. Enterprises, service and cloud providers, and leading online companies worldwide rely on F5 to optimize their IT investments and drive business forward. For more information, go to www.f5.com.

You can also follow @f5networks on Twitter or visit us on Facebook for more information about F5, its partners, and technology. For a complete listing of F5 community sites, please visit www.f5.com/news-press-events/web-media/community.html.

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Press Contacts

This press release may contain forward looking statements relating to future events or future financial performance that involve risks and uncertainties. Such statements can be identified by terminology such as "may," "will," "should," "expects," "plans," "anticipates," "believes," "estimates," "predicts," "potential," or "continue," or the negative of such terms or comparable terms. These statements are only predictions and actual results could differ materially from those anticipated in these statements based upon a number of factors including those identified in the company's filings with the SEC.