c12-mail.cnet.com has one IP number , which also has a corresponding reverse pointer. tv.com, mp3.com, zdnet.de, cnet.com, news.com and at least 75 other hosts use this as a mailserver. cnet.com is a domain controlled by three nameservers at cnet.com themselves. All of them are on different IP networks. Incoming mail for cnet.com is handled by two mailservers also at cnet.com. They are on different IP networks. cnet.com has two IP numbers. They are on different IP networks. c12-mail.cnet.com is hosted on a server in United States.