ns1.xm-rz.net has one IP number , which also has a corresponding reverse pointer. ns1.xmedia.ch and dns1.xmedia.ch point to the same IP. gkm.ch, chur.ch, avo.com, versa.ch, bscyb.ch and at least 100 other hosts use this as a nameserver. xm-rz.net is delegated to two nameservers, however both delegated nameservers are missing in the zone. All nameservers are at xm-rz.net themselves. They are on different IP networks. ns1.xm-rz.net is hosted on a server in Switzerland.