| Developer | Extreme Networks | 
|---|---|
| OS family | Unix-like | 
| Working state | Current | 
| Source model | Closed source and partly Open source | 
| Initial release | version 10.1: February, 2004 | 
| Latest release | v33.3.1.4 / 16.04.2025 | 
| Available in | English | 
| Platforms | Extreme Networks Network switches | 
| Kernel type | Monolithic (Linux) | 
|  Default user interface  | Command-line interface | 
| Official website |  www | 
ExtremeXOS is the software or the network operating system used in newer Extreme Networks network switches. [1] It is Extreme Networks second generation operating system after the VxWorks based ExtremeWare operating system.
ExtremeXOS is based on the Linux kernel and BusyBox. [2] In July 2008 legal action was taken against Extreme Networks due to alleged violation of the GNU General Public License. [3] Three months later the lawsuit was settled out of court. [4]