if you have a wildcard in dns records, you can effectively make it a fallback, so thats how our something.orgu.com addresses get mapped to an IP. however, we do

if you have a wildcard in dns records, you can effectively make it a fallback, so thats how our something.orgu.com addresses get mapped to an IP. however, we do allow tld's, we handle that by hosting our own instance of PowerDNS, which is great (u can use mysql with it)