ns.metro.de has one IP number , which also has a corresponding reverse pointer. ns1.gourmedis.com point to the same IP. mre.de, mgi.pl, mgi.de, mgr.de, mgi.ro and at least 100 other hosts use this as a nameserver. metro.de is a domain controlled by three nameservers. All of them are on different IP networks. Incoming mail for metro.de is handled by one mailserver at metro.info. metro.de has one IP number. ns.metro.de is hosted on a server in Germany.