Who owns MAC prefix 8C1F64EF5?

8C1F64EF5 is registered to Sigma Defense Systems LLC in the IEEE MA-S registry.

What devices use 8C1F64EF5?

Any network device with a MAC address starting 8C:1F:64:EF:5 was manufactured by or for Sigma Defense Systems LLC.

MA-S · OUI prefix

Sigma Defense Systems LLC

Any MAC address starting 8C:1F:64:EF:5 is registered to Sigma Defense Systems LLC in US.

OUI prefix	8C1F64EF5
Vendor	Sigma Defense Systems LLC
Registry	MA-S (36-bit, small block)
Country	US
Example MAC	8C:1F:64:EF:5:00:00:00

What this means

The IEEE assigned the MA-S block 8C1F64EF5 to Sigma Defense Systems LLC. 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 8C:1F:64:EF:5, it is Sigma Defense Systems LLC hardware.

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