http://www.fpsn.net/index.cgi?pg=tools&tool=ipv6-inaddr
$ ping6 www.fpsn.net
PING www.fpsn.net(2001:470:1f00:3278:2f00::58) 56 data bytes
From tamil-pt.tunnel.tserv1.fmt.ipv6.he.net icmp_seq=3 Destination unreachable: Address unreachable
From tamil-pt.tunnel.tserv1.fmt.ipv6.he.net icmp_seq=7 Destination unreachable: Address unreachable
EDIT:
I see the problem:
$ host www.fpsn.net
www.fpsn.net is an alias for fpsn.net.
fpsn.net has address 63.224.69.58
fpsn.net has IPv6 address 2001:470:1f00:3278:2f00::58
fpsn.net has IPv6 address 2001:470:1f00:3278:2f00::59
::58 is not reachable
::59 is reachable.
try this one
http://www.dnskey.net/Main.html