Who owns MAC prefix 9C3B91?

9C3B91 is registered to VSSL in the IEEE MA-L registry.

What devices use 9C3B91?

Any network device with a MAC address starting 9C:3B:91 was manufactured by or for VSSL.

MA-L · OUI prefix

VSSL

Any MAC address starting 9C:3B:91 is registered to VSSL in US.

OUI prefix	9C3B91
Vendor	VSSL
Registry	MA-L (24-bit, large block)
Country	US
Example MAC	9C:3B:91:00:00:00

What this means

The IEEE assigned the MA-L block 9C3B91 to VSSL. 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 9C:3B:91, it is VSSL hardware.

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