Who owns MAC prefix 7C55A7?

7C55A7 is registered to Kastle Systems in the IEEE MA-L registry.

What devices use 7C55A7?

Any network device with a MAC address starting 7C:55:A7 was manufactured by or for Kastle Systems.

MA-L · OUI prefix

Kastle Systems

Any MAC address starting 7C:55:A7 is registered to Kastle Systems in US.

OUI prefix	7C55A7
Vendor	Kastle Systems
Registry	MA-L (24-bit, large block)
Country	US
Example MAC	7C:55:A7:00:00:00

What this means

The IEEE assigned the MA-L block 7C55A7 to Kastle 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 7C:55:A7, it is Kastle Systems hardware.

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