http://www.ipv6forum.com/ipv6_enabled/isp/approval_list.php

IPv6@ccTLD
1. IPv6@ccTLD. CZ.NIC – http://www.nic.cz. Ondrej Filip / ondrej.filip@nic.cz. Jul 28 2012, Prague, ICANN, IPv6 session. Page 2. 2. Registry. l DNS servers …

http://ipv6securitylab.org/ipv6toolbox.html

http://labs.apnic.net/dists/v6dcc.html

http://www.circleid.com/posts/20120625_measuring_ipv6_country_by_country/