User Agent Category: Platforms

System-related signatures in User Agent strings, including the operating system running on client's computer, the type of computer, distributor of software or Internet service, the type of mobile device.

CategoryDescription
SoftwareIn this category we included infrastructure modules installed with the browser or the operating system, which appear in the User Agent string, as well as various software components or open-source code for HTTP, FTP or generic TCP/IP protocol.

MobileMany hendheld devices, cellphones, Pocket PCs, iPods, wireless ports, leave their specific signature in a User Agent string.

Operating SystemUser Agent string usually contain information about the Operating System installed on client's computer - such as Windows-based, Unix-based, Linux or Mac OS.

Provider/AdwareISPs (Internet Service Providers) or cellphone/mobile device service providers can include a specific signature in a traditional browser User Agent string. In some cases, this is done only for advertising purposes, to let other website owners know about their services. On client's browser, they may also change the title bar information, with a similar intent. Same category includes the type of client's computer, such as Compag or Amiga, when a specific distributor is mentionned.