A system, method, and computer-readable medium for IPv4 and IPv6 migration are provided. The invocation of NAPT-PT and NAPT are minimized inside a provider's network. NAPT-PT operations are invoked at most once inside the provider's network under all situations for a media path. Moreover, he minimum required NAPT operations are performed. If there is a required NAPT operation along the media path for IPv4 address realm mismatches, no NAPT-PT operation are performed solely for protocol conversion purposes.