mail.enca.cz has one IP number , via cname to ghs.google.com , but the reverse is vw-in-f121.1e100.net. mecog.de, mail.bkv.nu, jswmail.com, asp-pro.com, mail.dmc.tv and at least 100 other hosts point to the same IP. enca.cz is a domain controlled by two nameservers at editdns.net. They are on different IP networks. Incoming mail for enca.cz is handled by seven mailservers having a total of 27 IP numbers. Two mailservers have the same IP number. Some of them are on the same IP network. enca.cz has one IP number. mail.enca.cz is hosted on a server in United States even though the hostname implies Czech Republic.