User Agent Category: Operating System
User Agent string usually contain information about the Operating System installed on client's computer - such as Windows-based, Unix-based, Linux or Mac OS.
| Agent | Description |
|---|---|
| AIX | AIX Unix-like operating system, on RISC computers. |
| Amiga | Amiga operating system. |
| Apple Computer | Macintosh, eventually running on Power PC CPU, or other computer/platform/operating system of Apple. |
| BeOS |  BeOS operating system. |
| Caldera | Caldera OpenLinux is a defunct Linux distribution that was created by the former Caldera Systems (now SCO Group) corporation. |
| CentOS | Community ENTerprise Operating System is a free rebuild of source packages freely available. |
| Contiki | A dynamic operating system for memory-constrained networked embedded systems. |
| Debian | Free distribution of the GNU/Linux operating system. |
| FreeBSD | FreeBSD operating system (derived from BSD, the Berkley-based original Unix system). |
| HP-UX | HP-UX Unix-like operating system, on HP RISC computers. |
| IRIX | Computer operating system developed by Silicon Graphics, Inc. (SGI) to run natively on their 32 and 64-bit MIPS architecture workstations. |
| Kubuntu | User friendly operating system based on KDE, the K Desktop Environment, part of the Ubuntu project. |
| Linux | Free open-source Unix-type operating system originally created by Linus Torvalds with the assistance of developers around the world. |
| MorphOS | Mixed proprietary and open source operating system, produced for the Pegasos PowerPC (PPC)-processor-based computer. |
| NetBSD | Operating system derived from BSD, the Berkley-based original Unix system. |
| Nitro | Nintendo DS operating system, used by Opera browsers. |
| OpenBSD | Multiplatform Ultra-Secure Operating System. |
| OS/2 | Computer operating system, initially created by Microsoft and IBM, then later developed by IBM exclusively. |
| PalmOS | Palm operating system. |
| QNX | Unix-like real-time operating system. |
| Red Hat | Distributor of Linux-based operating system. |
| RISC OS | 32-bit RISC operating system, used in Acorn, Advantage Six, Microdigital and RiscStation computers. |
| Sun OS | Sun's Unix-based operating system. |
| Symbian OS | Operating system, used by Opera on mobile phones. |
| Ubuntu | Free Debian derived Linux-based operating system, available with both community and professional support. |
| UNIX | Operating System. |
| Windows |  Compiled browser version for a Windows operating system. Can be Win32 if seen with IE 7b1 on Windows XP, Win 9x 4.90 for Windows Me, Win16 for Windows 3.x, Windows CE for CE and Windows Mobile operating systems (used by IE Mobile), Windows 2000 for version 5.0, Windows 2000 SP1 for version 5.01, Windows XP for version 5.1, Windows Server 2003 and Windows XP Professional x64 Edition for version 5.2, Windows Vista for version 6.0. |
| X11 | Graphical X Window operating system, on top of a Unix-based platform. X11 for Mac OS X offers a complete X Window System implementation for running X11-based applications on Mac OS X. |
