Who owns MAC prefix 4C4BF9B?

4C4BF9B is registered to Stored Energy Systems in the IEEE MA-M registry.

What devices use 4C4BF9B?

Any network device with a MAC address starting 4C:4B:F9:B was manufactured by or for Stored Energy Systems.

MA-M · OUI prefix

Stored Energy Systems

Any MAC address starting 4C:4B:F9:B is registered to Stored Energy Systems in US.

OUI prefix	4C4BF9B
Vendor	Stored Energy Systems
Registry	MA-M (28-bit, medium block)
Country	US
Example MAC	4C:4B:F9:B:00:00:00

What this means

The IEEE assigned the MA-M block 4C4BF9B to Stored Energy 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:4B:F9:B, it is Stored Energy Systems hardware.

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