What this means
The IEEE assigned the MA-L block B01921 to TP-Link Systems 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 B0:19:21, it is TP-Link Systems Inc hardware.
Frequently Asked Questions
Who owns MAC prefix B01921?
B01921 is registered to TP-Link Systems 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. TP-Link Systems Inc's block covers 16,777,216 addresses.
What devices use B01921?
Any network device with a MAC address starting B0:19:21 was manufactured by or for TP-Link Systems Inc.