Who owns MAC prefix 504B5B?

504B5B is registered to CONTROLtronic GmbH in the IEEE MA-L registry.

What devices use 504B5B?

Any network device with a MAC address starting 50:4B:5B was manufactured by or for CONTROLtronic GmbH.

MA-L · OUI prefix

CONTROLtronic GmbH

Any MAC address starting 50:4B:5B is registered to CONTROLtronic GmbH in DE.

OUI prefix	504B5B
Vendor	CONTROLtronic GmbH
Registry	MA-L (24-bit, large block)
Country	DE
Example MAC	50:4B:5B:00:00:00

What this means

The IEEE assigned the MA-L block 504B5B to CONTROLtronic GmbH. 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 50:4B:5B, it is CONTROLtronic GmbH hardware.

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