IPv6 related RRs

RFC 3596

Forward lookup: AAAA RR
    www.kame.net. IN AAAA =>
        2001:200:0:8002:203:47ff:fea5:3085
c.f. similar to IPv4
    www.kame.net. IN A 203.178.141.194

Reverse lookup: PTR RR
TLD: ip6.arpa.
1 label for 4 bits, 32 labels, lower to upper
    ;;for 2001:0200:0000:4819:0280:adff:fe71:81fc
    $ORIGIN 9.1.8.4.0.0.0.0.0.0.2.0.1.0.0.2.ip6.arpa.
    c.f.1.8.1.7.e.f.f.f.d.a.0.8.2.0 IN PTR www.kame.net.