Summary
mxs1.siemens.at has one IP number , which also has a corresponding reverse pointer.
mail1.apcs.at,
mail1.agcs.at,
mail1.exaa.at,
mail1.ecra.at,
mail1.cismo.com and at least eight other hosts point to the same IP.
sbs.sk,
pvss.com,
sgpvt.at,
bill-e.at,
frust.net and at least 100 other hosts use this as a mailserver.
siemens.at is delegated to two nameservers, however one extra nameserver is listed in the zone. All nameservers are at
siemens.at themselves. Two of them are on the same IP network. Incoming mail for
siemens.at is handled by two mailservers also at
siemens.at. They are on the same IP network.
siemens.at has one IP number.
mxs1.siemens.at is hosted on a server in Germany even though the hostname implies Austria.