OpenBSD rocks built-in DNS64/NAT64
What is DNS64/NAT64
DNS64/NAT64 is a standard way for IPv6-only hosts to reach IPv4-only resources. For those who didn’t already know, you can get rid of native IPv4 for most clients on your network if you just deploy DNS64/NAT64 and route clients to it.
OpenBSD sports both DNS64 & NAT64 in the default install! OpenBSD can do DNS64 (built-in Unbound DNS has DNS64 included, or add the bind9 named which includes DNS64 as well), plus the built-in pf handles NAT64 via af-to, using the standard well-known 64:ff9b::/96, though you could use a different range if that doesn’t suit your fancy.
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