*.profesia.sk has one IP number , which is the same as for profesia.sk, via cname , which also has a corresponding reverse pointer. plat.sk, platy.sk, merces.hu, dielne.sk, merces.cz and at least 28 other hosts point to the same IP. profesia.sk is a domain controlled by three nameservers. All of them are on different IP networks. Incoming mail for profesia.sk is handled by two mailservers at profesia.sk themselves. They are on different IP networks. *.profesia.sk is hosted on a server in Slovakia.