What this means
The IEEE assigned the MA-L block 9C99A0 to Xiaomi Communications Co Ltd. 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 9C:99:A0, it is Xiaomi Communications Co Ltd hardware.
Frequently Asked Questions
Who owns MAC prefix 9C99A0?
9C99A0 is registered to Xiaomi Communications Co Ltd 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. Xiaomi Communications Co Ltd's block covers 16,777,216 addresses.
What devices use 9C99A0?
Any network device with a MAC address starting 9C:99:A0 was manufactured by or for Xiaomi Communications Co Ltd.