What this means
The IEEE assigned the MA-L block 0021CE to NTC-Metrotek. 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 00:21:CE, it is NTC-Metrotek hardware.
Frequently Asked Questions
Who owns MAC prefix 0021CE?
0021CE is registered to NTC-Metrotek 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. NTC-Metrotek's block covers 16,777,216 addresses.
What devices use 0021CE?
Any network device with a MAC address starting 00:21:CE was manufactured by or for NTC-Metrotek.