Who owns MAC prefix 00A003?

00A003 is registered to Siemens Switzerland Ltd., I B T HVP in the IEEE MA-L registry.

What devices use 00A003?

Any network device with a MAC address starting 00:A0:03 was manufactured by or for Siemens Switzerland Ltd., I B T HVP.

MA-L · OUI prefix

Siemens Switzerland Ltd., I B T HVP

Any MAC address starting 00:A0:03 is registered to Siemens Switzerland Ltd., I B T HVP in CH.

OUI prefix	00A003
Vendor	Siemens Switzerland Ltd., I B T HVP
Registry	MA-L (24-bit, large block)
Country	CH
Example MAC	00:A0:03:00:00:00

What this means

The IEEE assigned the MA-L block 00A003 to Siemens Switzerland Ltd., I B T HVP. Every network interface they manufacture under this block has a MAC address beginning with these digits, followed by a unique per-device identifier. If a device on your network shows a MAC starting 00:A0:03, it is Siemens Switzerland Ltd., I B T HVP hardware.

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