Who owns MAC prefix 18C3F43?

18C3F43 is registered to General Test Systems in the IEEE MA-M registry.

What devices use 18C3F43?

Any network device with a MAC address starting 18:C3:F4:3 was manufactured by or for General Test Systems.

MA-M · OUI prefix

General Test Systems

Any MAC address starting 18:C3:F4:3 is registered to General Test Systems in CN.

OUI prefix	18C3F43
Vendor	General Test Systems
Registry	MA-M (28-bit, medium block)
Country	CN
Example MAC	18:C3:F4:3:00:00:00

What this means

The IEEE assigned the MA-M block 18C3F43 to General Test Systems. 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 18:C3:F4:3, it is General Test Systems hardware.

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