It's 464XLAT http://tools.ietf.org/html/rfc6877 http://tools.ietf.org/html/rfc6877 As far as I can tell it works extremely well, using android 4.2.2 / nexus 5.

It's 464XLAT http://tools.ietf.org/html/rfc6877 http://tools.ietf.org/html/rfc6877 As far as I can tell it works extremely well, using android 4.2.2 / nexus 5. You get a real ipv6 address and, 192.0.0.4 for your ipv4 address. Applications think both ipv4 and ipv6 are available. Edit: above information is based on using T-Mobile USA for internet connectivity