What this means
The IEEE assigned the MA-L block 20AC9C to China Telecom Corporation Limited. 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 20:AC:9C, it is China Telecom Corporation Limited hardware.
Frequently Asked Questions
Who owns MAC prefix 20AC9C?
20AC9C is registered to China Telecom Corporation Limited 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. China Telecom Corporation Limited's block covers 16,777,216 addresses.
What devices use 20AC9C?
Any network device with a MAC address starting 20:AC:9C was manufactured by or for China Telecom Corporation Limited.