Who owns MAC prefix 002133?

002133 is registered to Building B, Inc in the IEEE MA-L registry.

What devices use 002133?

Any network device with a MAC address starting 00:21:33 was manufactured by or for Building B, Inc.

MA-L · OUI prefix

Building B, Inc

Any MAC address starting 00:21:33 is registered to Building B, Inc in US.

OUI prefix	002133
Vendor	Building B, Inc
Registry	MA-L (24-bit, large block)
Country	US
Example MAC	00:21:33:00:00:00

What this means

The IEEE assigned the MA-L block 002133 to Building B, Inc. 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 00:21:33, it is Building B, Inc hardware.

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