ns3.hq1.biz has one IP number , which is the same as for hq1.biz, but the reverse is www3.pipni.cz. d42.sk, 109.cz, 1dz.cz, c-4.cz, ceaf.cz and at least 100 other hosts point to the same IP. hq1.biz is a domain controlled by four nameservers at mydomain.com. All of them are on different IP networks. Incoming mail for hq1.biz is handled by one mailserver at hq1.biz themselves. ns3.hq1.biz is hosted on a server in Czech Republic.