[iamzenitraM]

Nice! I had been thinking for a while on building something like this but that provided reverse PTR records, too.

Some providers like Tunnelbroker easily allow you to change the delegation for the reverse records for your delegated range: if you have the 1234:5678:9abc:def0::/64 subnet, they let you change the delegation of the *.0.f.e.d.c.b.a.9.8.7.6.5.4.3.2.1.ip6.arpa DNS zone or add records to it as you please.

So having a public service that responded to those (following the example, all you would need is the server to respond to 0.f.e.d.c.b.a.9.8.7.6.5.4.3.2.1.0.f.e.d.c.b.a.9.8.7.6.5.4.3.2.1.ip6.arpa with a PTR record to 1234-5678-9abc-def0-1234-5678-9abc-def0.has-a.name) would enable you to also make reverse DNS work for all your network easily, as long as you delegate your reverse zone to that server.

Unfortunately probably only Tunnelbroker and hosting providers allow you to do this - I don't expect any residential ISP would (they would also probably provide their own reverse DNS, though).