What this means
The IEEE assigned the MA-L block 40F21C to Zhone Technologies, Inc.. 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 40:F2:1C, it is Zhone Technologies, Inc. hardware.
Frequently Asked Questions
Who owns MAC prefix 40F21C?
40F21C is registered to Zhone Technologies, Inc. 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. Zhone Technologies, Inc.'s block covers 16,777,216 addresses.
What devices use 40F21C?
Any network device with a MAC address starting 40:F2:1C was manufactured by or for Zhone Technologies, Inc..