Siemens Switzerland Ltd., I B T HVP

Any device whose MAC address begins with 00:A0:03 has a network interface built by Siemens Switzerland Ltd., I B T HVP. This prefix (the OUI, or Organizationally Unique Identifier) is assigned by the IEEE and is the first three octets of the address.

OUI prefix

00:A0:03

Organization

Siemens Switzerland Ltd., I B T HVP

Address

Building Technologies Division, International Headquarters Zug CH 6301

Source

IEEE OUI registry

Have a full MAC address? Look it up— we'll also tell you if it's a randomized (private) address rather than a real manufacturer prefix.