Net::IPv6Addr provides functions for parsing IPv6 addresses in all
formats described by RFC1884.  If Math::Base85 is installed, formats
described in RFC1924 are also valid.  It will generate "IP6.INT."
strings (as described in RFC1886) if you are inclined to play with
DNS records.

WWW: http://search.cpan.org/dist/Net-IPv6Addr/