Who owns MAC prefix B81999?

B81999 is registered to Nesys in the IEEE MA-L registry.

What devices use B81999?

Any network device with a MAC address starting B8:19:99 was manufactured by or for Nesys.

MA-L · OUI prefix

Nesys

Any MAC address starting B8:19:99 is registered to Nesys in RU.

OUI prefix	B81999
Vendor	Nesys
Registry	MA-L (24-bit, large block)
Country	RU
Example MAC	B8:19:99:00:00:00

What this means

The IEEE assigned the MA-L block B81999 to Nesys. 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 B8:19:99, it is Nesys hardware.

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