dns.noris.net has one IP number , but the reverse is dns1.noris.net. dns1.noris.net and dns1.mwb-edv.de point to the same IP. muh.cc, geme.in, ostc.de, solyp.de, 3soft.de and at least 100 other hosts use this as a nameserver. noris.net is a domain controlled by three nameservers. All of them are on different IP networks. Incoming mail for noris.net is handled by three mailservers. Two mailservers have the same IP number. Some of them are on the same IP network. noris.net has one IP number. dns.noris.net is hosted on a server in Germany.