What this means
The IEEE assigned the MA-L block C83374 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 C8:33:74, it is Zyxel Communications Corporation hardware.
Frequently Asked Questions
Who owns MAC prefix C83374?
C83374 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 C83374?
Any network device with a MAC address starting C8:33:74 was manufactured by or for Zyxel Communications Corporation.