F5, Inc. is an American technology company specializing in application security, multi-cloud management, online fraud prevention, application delivery networking, application availability and performance, and network security, access, and authorization. F5 originally offered application delivery controller technology, but has since expanded into application layer, automation, multi-cloud, and security services. F5 is headquartered in Seattle, Washington in F5 Tower, with an additional 75 offices in 43 countries focusing on account management, global services support, product development, manufacturing, software engineering, and administrative jobs. Office locations include Spokane, Washington; New York, New York; Boulder, Colorado; London, England; San Jose, California; and San Francisco, California. The majority of F5's revenue continues to be attributed to its hardware products, such as the BIG-IP iSeries systems. The company has begun to offer additional modules on its proprietary operating system, TMOS. These modules include Local Traffic Manager, Advanced Web Application Firewall, DNS, and Access Policy Manager. Wikipedia