don.martin.sk has one IP number , which also has a corresponding reverse pointer. mx2.datacom.sk and ns2.datacom.sk point to the same IP. martin.sk is a domain controlled by three nameservers at datacom.sk. All of them are on different IP networks. Incoming mail for martin.sk is handled by three mailservers. Two of them are on the same IP network. martin.sk has one IP number , but the reverse is beny.datacom.sk. don.martin.sk is hosted on a server in Slovakia.