Cisco IOS XR
| Developer | Cisco Systems | 
|---|---|
| OS family | Unix-like | 
| Working state | Current | 
| Source model | Closed source | 
| Latest release | 24.4.2 / March 21, 2025 | 
| Platforms | NCS 5x0, NCS 5x00, 8000, ASR 9000 and XRv 9000 Series Routers | 
| Userland | Linux | 
| Official website | Cisco IOS XR | 
IOS XR is a release train of Cisco Systems' widely deployed Internetwork Operating System (IOS), used on their high-end Network Convergence System (NCS) and carrier-grade routers such as the ASR 9000 series and Carrier Routing System series of routers.