Who is operating IPv6 tunnel services?
In order to migrate to IPv6 different methods are available, one of them is using IPv6 in IPv4 tunnels. These tunnels come in different flavors, static tunnel or dynamic tunnels. Dynamic tunneling protocols such as 6to4 and teredo use anycast technology. A number of organizations have employed 6to4 or teredo relays and it’s not always easy for an end user to see which relay you are using because they all have the same IP address. I’ve created a list of Autonomous systems that are announcing the 6to4 (IPv4 184.108.40.206/24 and IPv6 2002::/16) anycast prefix. The same is done for autonomous systems that announce the teredo relay prefix (2001::/32). This list is dynamically generated by analyzing all BGP announcements and scanning for the relevant tunnel prefixes. The data available on this website contains data that goes back to 2001 (using RIB snapshots) and will be updated continuously. So if you’re interested in a list of current or historically autonomous systems that operate a 6to4 routers or teredo relays please take a look here: http://www.bgpmon.net/6to4.php?week=210