Who owns MAC prefix 0004C3?

0004C3 is registered to CASTOR Informatique in the IEEE MA-L registry.

What devices use 0004C3?

Any network device with a MAC address starting 00:04:C3 was manufactured by or for CASTOR Informatique.

MA-L · OUI prefix

CASTOR Informatique

Any MAC address starting 00:04:C3 is registered to CASTOR Informatique in FR.

OUI prefix	0004C3
Vendor	CASTOR Informatique
Registry	MA-L (24-bit, large block)
Country	FR
Example MAC	00:04:C3:00:00:00

What this means

The IEEE assigned the MA-L block 0004C3 to CASTOR Informatique. 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 00:04:C3, it is CASTOR Informatique hardware.

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