What this means
The IEEE assigned the MA-L block 4C9EFF to Zyxel Communications Corporation. 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:9E:FF, it is Zyxel Communications Corporation hardware.
Frequently Asked Questions
Who owns MAC prefix 4C9EFF?
4C9EFF is registered to Zyxel Communications Corporation 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. Zyxel Communications Corporation's block covers 16,777,216 addresses.
What devices use 4C9EFF?
Any network device with a MAC address starting 4C:9E:FF was manufactured by or for Zyxel Communications Corporation.