What this means
The IEEE assigned the MA-L block F44D5C 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 F4:4D:5C, it is Zyxel Communications Corporation hardware.
Frequently Asked Questions
Who owns MAC prefix F44D5C?
F44D5C 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 F44D5C?
Any network device with a MAC address starting F4:4D:5C was manufactured by or for Zyxel Communications Corporation.