769903119.csi.cam.ac.uk has one IP number , via cname to domains.live.com , which also has a corresponding reverse pointer. 99v.cn, u86.com, dugn.net, jzvan.com, yjmdh.com and at least 100 other hosts point to the same IP. Incoming mail for csi.cam.ac.uk is handled by one mailserver having a total of five IP numbers. All of them are on the same IP network. 769903119.csi.cam.ac.uk is hosted on a server in United States even though the hostname implies United Kingdom.