mail.tedata.com has one IP number , but the reverse is mx51.mymxserver.com. mail.muo.de, mail.ogn.at, mail.kfm.de, mail.efgb.de, mail.kcda.de and at least 100 other hosts point to the same IP. tedata.com is a domain controlled by three nameservers. All of them are on different IP networks. Incoming mail for tedata.com is handled by two mailservers having a total of three IP numbers. There are three duplicated IP numbers. Some of them are on the same IP network. tedata.com has one IP number. mail.tedata.com is hosted on a server in Germany.