mx1.ose.fr has one IP number , but the reverse is mx-vh.amenworld.com. mx1.iia.fr, mx1.erl.fr, mx1.can.pt, neotia.com, mx1.hhns.fr and at least 100 other hosts point to the same IP. ose.fr is a domain controlled by two nameservers at 1and1.fr. They are on different IP networks. Incoming mail for ose.fr is handled by two mailservers having a total of four IP numbers. There are four duplicated IP numbers. Some of them are on the same IP network. ose.fr has one IP number. mx1.ose.fr is hosted on a server in United Kingdom even though the hostname implies France.