DNS Extensions for IPv6

A new resource record defined as an AAAA record has been specified by RFC 1886. This AAAA record maps a host name into an 128-bit IPv6 address. The existing PTR record is still used with IPv6 to map IP addresses into host names. The 32 4-bit nibbles of the 128-bit address are reversed for an IPv6 address. Each nibble is converted to its corresponding hexadecimal ASCII value with ip6.int appended to it.