According to the torrc man page: "Address: The IP address or fully qualified domain name of this server (e.g. moria.mit.edu)." In torrc, set the Address to an IPv6 address and port using standard notation: Address [1234:5678::01:1234] ---- The tor server starts up, and doesn't appear to give any relevant warnings, but log output suggests tor is ignoring the address setting and guessing anyway. Apr 09 15:50:52.000 [notice] Guessed our IP address as 1.2.3.4 (source: 5.6.7.8). This server is configured only with IPv6 settings for tor, and the goal is to have it ignore any IPv4 addresses present on the host, so this behavior is undesirable. **Trac**: **Username**: ItsNannerpuss