xlink1.xlink.net has one IP number , which also has a corresponding reverse pointer. ns1.rzone.de point to the same IP. msh.de, ron.de, rlb.de, fum.de, ovz.de and at least 100 other hosts use this as a nameserver. xlink.net is a domain controlled by two nameservers at de.kpn-eurorings.net. They are on different IP networks. Incoming mail for xlink.net is handled by one mailserver having a total of two IP numbers. They are on the same IP network. xlink1.xlink.net is hosted on a server in Germany.