ns4.gratisdns.dk has one IP number , which also has a corresponding reverse pointer. ns2.koep.net point to the same IP. c.cx, bap.dk, gld.dk, rpd.dk, dfk.no and at least 100 other hosts use this as a nameserver. gratisdns.dk is a domain controlled by five nameservers at gratisdns.dk themselves. All of them are on different IP networks. Incoming mail for gratisdns.dk is handled by one mailserver at mxhotel.dk. gratisdns.dk has one IP number. ns4.gratisdns.dk is hosted on a server in United States even though the hostname implies Denmark.