mx.faktor-2.ru has one IP number , but the reverse is mu-in-f27.1e100.net. 1e.ca, mx2.z51.fr, sagaci.com, mx2.ctrl.it, mx.faktor2.ru and at least 100 other hosts point to the same IP. faktor-2.ru use this as a mailserver. faktor-2.ru is a domain controlled by two nameservers at faktor-2.ru themselves. They are on different IP networks. Incoming mail for faktor-2.ru is handled by eight mailservers having a total of 28 IP numbers. Two mailservers have the same IP number. Some of them are on the same IP network. faktor-2.ru has one IP number. mx.faktor-2.ru is hosted on a server in United States even though the hostname implies Russian Federation.