UC3M The IPv6 Company 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 required in the IPv6 client neither the IPv4 server. At the time of writing this document, Stateful NAT64 has been widely and succesfully deployed across many networks in Internet.