mail.5co.org has one IP number , but the reverse is mail.pipni.cz. mail.uk.cz, mail.190.as, mail.3am.cz, mail.c-4.cz, mail.1dz.cz and at least 100 other hosts point to the same IP. 5co.org is a domain controlled by three nameservers at pipni.cz. All of them are on different IP networks. Incoming mail for 5co.org is handled by seven mailservers having a total of 28 IP numbers. Some of them are on the same IP network. 5co.org has one IP number. mail.5co.org is hosted on a server in Czech Republic.