hostmaster.enca.cz has one IP number , which is the same as for enca.cz, via cname , but the reverse is www2.pipni.cz. l.cz, 3am.cz, k28.org, hkcz.cz, 5co.org 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 28 IP numbers. Some of them are on the same IP network. hostmaster.enca.cz is hosted on a server in Czech Republic.