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.
Frequently Asked Questions
Who owns MAC prefix 000C3F?
000C3F is registered to Cogent Defence & Security Networks, in the IEEE MA-L registry.
What does the MA-L registry type mean?
An MA-L assignment, the IEEE's original OUI format, gives the vendor the first three octets and 16,777,216 device addresses under them. Cogent Defence & Security Networks,'s block covers 16,777,216 addresses.
What devices use 000C3F?
Any network device with a MAC address starting 00:0C:3F was manufactured by or for Cogent Defence & Security Networks,.