Who owns MAC prefix 000B40?

000B40 is registered to Cambridge Industries Group (CIG) in the IEEE MA-L registry.

What devices use 000B40?

Any network device with a MAC address starting 00:0B:40 was manufactured by or for Cambridge Industries Group (CIG).

MA-L · OUI prefix

Cambridge Industries Group (CIG)

Any MAC address starting 00:0B:40 is registered to Cambridge Industries Group (CIG) in US.

OUI prefix	000B40
Vendor	Cambridge Industries Group (CIG)
Registry	MA-L (24-bit, large block)
Country	US
Example MAC	00:0B:40:00:00:00

What this means

The IEEE assigned the MA-L block 000B40 to Cambridge Industries Group (CIG). 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 00:0B:40, it is Cambridge Industries Group (CIG) hardware.

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