> For the complete documentation index, see [llms.txt](https://fusionauth.io/docs/llms.txt)

# Required Network Hostname Access

Learn which hostnames you must allow access to for FusionAuth to work.

If you have a FusionAuth instance with a license, you must allow access to the following hostnames.

*   `https://reactor.fusionauth.io`
*   `https://metrics.fusionauth.io`
*   `https://license.fusionauth.io`

Learn more about [network requirements](https://fusionauth.io/docs/get-started/download-and-install/reference/system-requirements.md#network-access) for running FusionAuth.