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.
Frequently Asked Questions
Who owns MAC prefix 4CEFE1?
4CEFE1 is registered to Dynacon Sp. z o.o. in the IEEE MA-L registry.
What does the MA-L registry type mean?
An MA-L assignment, the IEEE's original OUI format, gives the vendor the first three octets and 16,777,216 device addresses under them. Dynacon Sp. z o.o.'s block covers 16,777,216 addresses.
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..