For ipv6 there is:
http://v6.ipv6-test.com/api/myip.php (ipv6 forced) http://v4.ipv6-test.com/api/myip.php (ipv4 forced) http://ipv6-test.com/api/myip.php (ipv6 preferred)
For ipv6 there is:
http:// v6.ipv6- test.com/ api/myip. php (ipv6 forced) v4.ipv6- test.com/ api/myip. php (ipv4 forced) ipv6-test. com/api/ myip.php (ipv6 preferred)
http://
http://