I'm going to answer two posts here. First you're correct this appears to be a 6rd, and it is a /60 IPv6 Status Available Global Unicast IPv6 Address 2602:306:cddd:1c50::/60 Border Relay IPv4 Address 12.83.49.81 On 11/23/2013 1:58 AM, Constantine A. Murenin wrote:
On 22 November 2013 22:22, Andrew D Kirch <trelane@trelane.net> wrote:
Status Available Global IPv6 Address 2602:306:cddd:xxxx::1/64 Link-local IPv6 Address fe80::923e:abff:xxxx:7e40 Router Advertisement Prefix 2602:306:cddd:xxxx::/64 IPV6 Delegated LAN Prefix 2602:306:cddd:xxxx:: 2602:306:cddd:xxxx:: I don't believe this is native IPv6; it's probably still their 6rd, which has, in fact, been live since at least February 2012, i.e. for close to two years at this point.
http://tu.cnst.su/post/16958139578/at-t-u-verse-6rd-in-santa-clara-county http://www.tunnelbroker.net/forums/index.php?topic=2293.0
And, yes, AT&T is probably still keeping this whole thing a secret.
C.