# Required Network Hostname Access

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

> For the index of this section of the site, see [llms.txt](https://4002.18-224-161-104.sslip.io/docs/llms.txt)

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://4002.18-224-161-104.sslip.io/docs/get-started/download-and-install/reference/system-requirements.md#network-access) for running FusionAuth.
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## Other pages in Reference

> For the full index of this section, see [Reference](https://4002.18-224-161-104.sslip.io/docs/llms-reference.txt).

- [API Endpoints Guarded by API Keys](https://4002.18-224-161-104.sslip.io/docs/reference/api-endpoints.md): A complete reference of all Fusionauth REST API Endpoints that leverage API Keys with their supported HTTP methods.
- [Authentication Types](https://4002.18-224-161-104.sslip.io/docs/reference/authentication-types.md): Learn about the supported types of authentication.
- [Configuration Reference](https://4002.18-224-161-104.sslip.io/docs/reference/configuration.md): Learn about the configuration options for FusionAuth.
- [Login Page Cookies](https://4002.18-224-161-104.sslip.io/docs/reference/cookies.md): Learn about the cookies set by FusionAuth.
- [Data Types](https://4002.18-224-161-104.sslip.io/docs/reference/data-types.md): Learn about the different data types used by FusionAuth.
- [Indexed Entity Fields](https://4002.18-224-161-104.sslip.io/docs/reference/entity-fields.md): Learn about the entity fields that are indexed and searchable.
- [GDPR Compliance](https://4002.18-224-161-104.sslip.io/docs/reference/gdpr.md): Learn how FusionAuth approaches GDPR compliance.
- [Password-Hashing Algorithms](https://4002.18-224-161-104.sslip.io/docs/reference/password-hashes.md): This is a reference for all of the current password hashing algorithms support by FusionAuth out of the box.
- [Indexed User Fields](https://4002.18-224-161-104.sslip.io/docs/reference/user-fields.md): Learn about the user fields that are indexed and searchable.