doing a search for domains

Hello, I am curious about creating a script that would bring me results of a search organized not by the actual name of the domain but the lenght of each part of a domain. This is an example: Domains that finish in .com/.net/.org with the lenght of one character: a.com a.net a.org b.com b.net b.org c.com .. aa.com aa.net aa.org .. aaa.com .. I was thinking that I would need the following: [a] a crowler for search for the domains and hosts; [b] a routine that would check and "clean" the actual captured domains; [c] a routine to present the captured and organized domains by size; Any ideas how should I start? Anyone wants to help? Thank you in advance, Rom