smtp.artech.se has two IP numbers. They are on different IP networks. ns.artech.se, ns1.artech.se, ns2.artech.se, mail.artech.se, mhost.artech.se and at least four other hosts point to the same IP. jog.se, rel.se, jak.se, cams.se, jbh.net and at least 100 other hosts use this as a mailserver. artech.se is delegated to three nameservers, however one extra nameserver is listed in the zone. All nameservers are at wineasy.se having a total of four IP numbers. Two nameservers have the same IP number. Some of them are on the same IP network. Incoming mail for artech.se is handled by two mailservers having a total of three IP numbers. Two of them are on the same IP network. artech.se has one IP number. smtp.artech.se is hosted on two servers in Sweden.