ns100.spindns.com has one IP number , which also has a corresponding reverse pointer. fnc.dk, bunp.com, ccxcs.com, ccxcs.net, camsex.com and at least 100 other hosts use this as a nameserver. spindns.com is a domain controlled by three nameservers at spindns.com themselves. All of them are on the same IP network. Incoming mail for spindns.com is handled by three mailservers also at spindns.com. All of them are on the same IP network. ns100.spindns.com is hosted on a server in Netherlands.