mail.peweco.de has one IP number. kr3.de, dchq.de, gist.de, flysn.de, limpa.de and at least 100 other hosts point to the same IP. peweco.de use this as a mailserver. peweco.de is a domain controlled by two nameservers at ns.de.uu.net. They are on different IP networks. Incoming mail for peweco.de is handled by two mailservers at peweco.de themselves having a total of three IP numbers. Two of them are on the same IP network. mail.peweco.de is hosted on a server in Germany.