
274 Chapter 3—DNS for IPv6
manages a prefix 2001:db8:1234:abcd::/64, the corresponding ip6.arpa zone is
d.c.b.a.4.3.2.1.8.b.d.0.1.0.0.2.ip6.arpa.
Just like a zone for IPv4 reverse mapping, this ip6.arpa zone will usually only contain SOA,
NS, and PTR resource records. For example, the reverse mapping for www.kame.example in
the preceding example is represented in this zone as follows:
1.0.0.0.0.0.0.0.0.0.0.0.0.0.0.0 PTR www.kame.example.
Previously, the obsolete well-known domain suffix for IPv6 reverse mapping, ip6.int,
coexisted with ip6.arpa, and resolver implementations varied: some only used ip6.int,
and others only tried ip6.arpa. Zone administrators ...