[akira2501]

NAT64? It's still an absolute mess. From http://en.wikipedia.org/wiki/NAT64:

"Not everything is accessible with NAT64, such as SIP, Skype, MSN, and sites with IPv4 literals.[a] However, 464XLAT RFC 6877,[3] which uses NAT64, allows for such protocols over ipv6 only connections."

[zaphoyd]

Agreed. None of the options for accessing IPv4 only websites via IPv6 only hosts are great. If you are running an IPv4 only website or service this should hopefully worry you.