Who owns MAC prefix 4CEFE1?

4CEFE1 is registered to Dynacon Sp. z o.o. in the IEEE MA-L registry.

What devices use 4CEFE1?

Any network device with a MAC address starting 4C:EF:E1 was manufactured by or for Dynacon Sp. z o.o..

MA-L · OUI prefix

Dynacon Sp. z o.o.

Any MAC address starting 4C:EF:E1 is registered to Dynacon Sp. z o.o. in PL.

OUI prefix	4CEFE1
Vendor	Dynacon Sp. z o.o.
Registry	MA-L (24-bit, large block)
Country	PL
Example MAC	4C:EF:E1:00:00:00

What this means

The IEEE assigned the MA-L block 4CEFE1 to Dynacon Sp. z o.o.. 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:EF:E1, it is Dynacon Sp. z o.o. hardware.

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