c.sec-ns.de has one IP number , which also has a corresponding reverse pointer. sec-2.ision.net point to the same IP. w3b.de, nrv.de, eon.de, dat.de, dgb.de and at least 100 other hosts use this as a nameserver. sec-ns.de is a domain controlled by four nameservers. Two of them are on the same IP network. c.sec-ns.de is hosted on a server in Germany.