Headscale serves as an open-source, self-managed version of the control server utilized by the Tailscale network, allowing users to maintain complete ownership of their private tailnets while employing Tailscale clients. It offers capabilities for registering users and nodes, generating pre-authentication keys, advertising subnet routes and exit nodes, enforcing access controls, and integrating with identity providers like OIDC/SAML for user authentication. The server can be deployed using Debian/Ubuntu packages or as standalone binaries and is configurable through a YAML file, with management options available via its command-line interface or REST API. Headscale maintains a comprehensive database that tracks each node, route, and user, supports workflows for route approvals, and offers features such as subnet routing, the designation of exit nodes, and direct node-to-node connections within the tailnet. By being self-hosted, it empowers organizations and enthusiasts to retain complete control over their private network endpoints, encryption keys, and traffic flows, eliminating reliance on a commercial control plane. This level of control not only enhances security but also provides flexibility for users to customize their networking solutions according to their specific needs.