AIUI, all software should interpret it as an ipv4 address, because the first character in the tld is a digit. www.example.42 should result in failure without a

AIUI, all software should interpret it as an ipv4 address, because the first character in the tld is a digit. www.example.42 should result in failure without a dns lookup for the same reason. (I know, sarcasm doesn't travel well online.)