The surbl.org project (identification of URLs in email messages for anti spam purpose) already have a list of 2 levels domains that accept domains at the 3rd level :
http://www.surbl.org/two-level-tlds
This could be used as a speedup for common domains before doing the DNS search.
The surbl.org project (identification of URLs in email messages for anti spam
purpose) already have a list of 2 levels domains that accept domains at the 3rd
level :
http:// www.surbl. org/two- level-tlds
This could be used as a speedup for common domains before doing the DNS search.