Hurricane Electric's IPv6 tunnelbroker service went offline when its domain registration expired, leaving users unable to access the popular tunneling service. The outage affects tunnelbroker.net, a widely used platform that allows users to create IPv6 tunnels over IPv4 networks.

For years, Hurricane Electric has provided this free service to help organizations and individuals deploy IPv6 connectivity. The tunnelbroker.net page typically offers tools for creating tunnels, checking IPv6 connectivity, and managing tunnel endpoints. The service has been a cornerstone for many users transitioning to IPv6.

Domain expiration can happen when automatic renewal fails or payment methods become outdated. The outage demonstrates how critical infrastructure services can be disrupted by administrative oversights. Users attempting to access the service now encounter standard domain expiration messages instead of the familiar tunnel configuration interface.