Who owns MAC prefix 3C3F51?

3C3F51 is registered to 2CRSI in the IEEE MA-L registry.

What devices use 3C3F51?

Any network device with a MAC address starting 3C:3F:51 was manufactured by or for 2CRSI.

MA-L · OUI prefix

2CRSI

Any MAC address starting 3C:3F:51 is registered to 2CRSI in FR.

OUI prefix	3C3F51
Vendor	2CRSI
Registry	MA-L (24-bit, large block)
Country	FR
Example MAC	3C:3F:51:00:00:00

What this means

The IEEE assigned the MA-L block 3C3F51 to 2CRSI. 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 3C:3F:51, it is 2CRSI hardware.

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