dns7.hichina.com has three IP numbers. All of them are on different IP networks. nyd.cn, nuo.cn, izt.cn, cfen.cn, cmiw.cn and at least 100 other hosts use this as a nameserver. czruihua.com and leadgo.net.cn use this as a mailserver. ns2.dns7.hichina.com are subdomains to this hostname. hichina.com is a domain controlled by two nameservers having a total of four IP numbers. Some of them are on the same IP network. Incoming mail for hichina.com is handled by two mailservers at hichina.com themselves. They are on different IP networks. hichina.com has one IP number. dns7.hichina.com is hosted on three servers in China.