*.expert.cz has one IP number , which is the same as for expert.cz, via cname , but the reverse is www2.pipni.cz. l.cz, 3am.cz, k28.org, enca.cz, hkcz.cz and at least 100 other hosts point to the same IP. expert.cz is a domain controlled by three nameservers at pipni.cz. Two of them are on the same IP network. Incoming mail for expert.cz is handled by two mailservers on different IP networks. *.expert.cz is hosted on a server in Czech Republic.