dynv6.net is on the public suffix list: https://publicsuffix.org/list/public_suffix_list.dat https://publicsuffix.org/list/public_suffix_list.dat The other doma

dynv6.net is on the public suffix list: https://publicsuffix.org/list/public_suffix_list.dat https://publicsuffix.org/list/public_suffix_list.dat The other domains they offer apparently aren't.