Stateful NAT64: Network Address and Protocol Translation from IPv6 Clients to IPv4 Servers
RFC 6146

Received changes through RFC Editor sync (changed abstract to 'This document describes stateful NAT64 translation, which allows IPv6-only clients to contact IPv4 servers using unicast UDP, TCP, or ICMP.  One or more public IPv4 addresses assigned to a NAT64 translator are shared among several IPv6-only clients.  When stateful NAT64 is used in conjunction with DNS64, no changes are usually required in the IPv6 client or the IPv4 server.')