Who owns MAC prefix 001981?

001981 is registered to Vivox Inc in the IEEE MA-L registry.

What devices use 001981?

Any network device with a MAC address starting 00:19:81 was manufactured by or for Vivox Inc.

MA-L · OUI prefix

Vivox Inc

Any MAC address starting 00:19:81 is registered to Vivox Inc in US.

OUI prefix	001981
Vendor	Vivox Inc
Registry	MA-L (24-bit, large block)
Country	US
Example MAC	00:19:81:00:00:00

What this means

The IEEE assigned the MA-L block 001981 to Vivox 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 00:19:81, it is Vivox Inc hardware.

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