ns1.dipserver.com has one IP number. ns2.dipns.com point to the same IP. 1c.cn, qto.cn, sztz.net, mzcx.net, cgzn.com and at least 100 other hosts use this as a nameserver. dipserver.com is delegated to two nameservers, however both delegated nameservers are missing in the zone and one other nameserver is listed. All nameservers are at dipserver.com themselves. All of them are on different IP networks. ns1.dipserver.com is hosted on a server in China.