Who owns MAC prefix 4C5585?

4C5585 is registered to Hamilton Systems in the IEEE MA-L registry.

What devices use 4C5585?

Any network device with a MAC address starting 4C:55:85 was manufactured by or for Hamilton Systems.

MA-L · OUI prefix

Hamilton Systems

Any MAC address starting 4C:55:85 is registered to Hamilton Systems in US.

OUI prefix	4C5585
Vendor	Hamilton Systems
Registry	MA-L (24-bit, large block)
Country	US
Example MAC	4C:55:85:00:00:00

What this means

The IEEE assigned the MA-L block 4C5585 to Hamilton 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 4C:55:85, it is Hamilton Systems hardware.

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