Who owns MAC prefix B4CEFE?

B4CEFE is registered to James Czekaj in the IEEE MA-L registry.

What devices use B4CEFE?

Any network device with a MAC address starting B4:CE:FE was manufactured by or for James Czekaj.

MA-L · OUI prefix

James Czekaj

Any MAC address starting B4:CE:FE is registered to James Czekaj in US.

OUI prefix	B4CEFE
Vendor	James Czekaj
Registry	MA-L (24-bit, large block)
Country	US
Example MAC	B4:CE:FE:00:00:00

What this means

The IEEE assigned the MA-L block B4CEFE to James Czekaj. 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 B4:CE:FE, it is James Czekaj hardware.

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