mail.ayt.at has one IP number , which is the same as for ayt.at, but the reverse is dd15122.kasserver.com. ayt.at, goez.at, efgw.de, romu.com, thombo.net and at least 89 other hosts point to the same IP. ayt.at use this as a mailserver. ayt.at is a domain controlled by two nameservers at kasserver.com. They are on the same IP network. Incoming mail for ayt.at is handled by one mailserver at ayt.at themselves. mail.ayt.at is hosted on a server in Germany even though the hostname implies Austria.