nes-proj/core/net/ip64-addr
..
ip64-addr.c
ip64-addr.h
README.md

The ip64-addr module converts between IPv4 addresses and IPv4-encoded IPv6 addresses. It is used in IPv6 networks that are attached to the IPv4 world through an ip64 router. With such a router, IPv6 nodes in the network can reach IPv4 nodes by using their IPv6-encoded address.