xns01lhr.rim.net has one IP number , which also has a corresponding reverse pointer. bbmail2.10808.ch point to the same IP. rim.pr, rim.vn, rim.net, rim.com, pagebb.com and at least 100 other hosts use this as a nameserver. rim.net is a domain controlled by two nameservers at rim.net themselves. They are on different IP networks. Incoming mail for rim.net is handled by three mailservers also at rim.net. All of them are on the same IP network. rim.net has one IP number. xns01lhr.rim.net is hosted on a server in United Kingdom.