What this means
The IEEE assigned the MA-L block 0021B9 to Universal Devices 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 00:21:B9, it is Universal Devices Inc. hardware.
Frequently Asked Questions
Who owns MAC prefix 0021B9?
0021B9 is registered to Universal Devices 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. Universal Devices Inc.'s block covers 16,777,216 addresses.
What devices use 0021B9?
Any network device with a MAC address starting 00:21:B9 was manufactured by or for Universal Devices Inc..