Who owns MAC prefix 000C3F?

000C3F is registered to Cogent Defence & Security Networks, in the IEEE MA-L registry.

What devices use 000C3F?

Any network device with a MAC address starting 00:0C:3F was manufactured by or for Cogent Defence & Security Networks,.

MA-L · OUI prefix

Cogent Defence & Security Networks,

Any MAC address starting 00:0C:3F is registered to Cogent Defence & Security Networks,.

OUI prefix	000C3F
Vendor	Cogent Defence & Security Networks,
Registry	MA-L (24-bit, large block)
Example MAC	00:0C:3F:00:00:00

What this means

The IEEE assigned the MA-L block 000C3F to Cogent Defence & Security Networks,. 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 00:0C:3F, it is Cogent Defence & Security Networks, hardware.

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