For SixXS 6in4 tunnel users: you will need to look for alternatives as SixXS will stop operations in June 2017.
SixXS is one of the oldest 6in4 IPv6 tunnel providers and has operated since 1999. I used it myself in 2009-2015 before getting native IPv6.
Sunsetting SixXS
SixXS will be sunset in H1 2017. All services will be turned down on 2017-06-06, after which the SixXS project will be retired. Users will no longer be able to use their IPv6 tunnels or subnets after this date, and are required to obtain IPv6 connectivity elsewhere, primarily with their Internet service provider.
(Last edited by hnyman on 1 Apr 2017, 12:32)