What this means
The IEEE assigned the MA-L block D021F9 to Ubiquiti 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 D0:21:F9, it is Ubiquiti Inc hardware.
Frequently Asked Questions
Who owns MAC prefix D021F9?
D021F9 is registered to Ubiquiti 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. Ubiquiti Inc's block covers 16,777,216 addresses.
What devices use D021F9?
Any network device with a MAC address starting D0:21:F9 was manufactured by or for Ubiquiti Inc.