ns3.siemens.at has one IP number , which also has a corresponding reverse pointer. vai.at, eybl.at, iserv.cc, elin.com, bohler.de and at least 41 other hosts use this as a nameserver. 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. ns3.siemens.at is hosted on a server in Austria.