ns2.bom.dk has one IP number , which also has a corresponding reverse pointer. ns2.unrestrictedhosting.net point to the same IP. 750.dk, ope.dk, fev.dk, bom.dk, 6cam.dk and at least 100 other hosts use this as a nameserver. bom.dk is a domain controlled by two nameservers at bom.dk themselves. They are on different IP networks. Incoming mail for bom.dk is handled by one mailserver also at bom.dk. bom.dk has one IP number. ns2.bom.dk is hosted on a server in Germany even though the hostname implies Denmark.