Who owns MAC prefix 643139B?

643139B is registered to Alphago GmbH in the IEEE MA-M registry.

What devices use 643139B?

Any network device with a MAC address starting 64:31:39:B was manufactured by or for Alphago GmbH.

MA-M · OUI prefix

Alphago GmbH

Any MAC address starting 64:31:39:B is registered to Alphago GmbH in DE.

OUI prefix	643139B
Vendor	Alphago GmbH
Registry	MA-M (28-bit, medium block)
Country	DE
Example MAC	64:31:39:B:00:00:00

What this means

The IEEE assigned the MA-M block 643139B to Alphago 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 64:31:39:B, it is Alphago GmbH hardware.

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