What this means
The IEEE assigned the MA-M block ACEF920 to CEER NATIONAL AUTOMOTIVE COMPANY. 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 AC:EF:92:0, it is CEER NATIONAL AUTOMOTIVE COMPANY hardware.
Frequently Asked Questions
Who owns MAC prefix ACEF920?
ACEF920 is registered to CEER NATIONAL AUTOMOTIVE COMPANY in the IEEE MA-M registry.
What does the MA-M registry type mean?
An MA-M assignment covers 28 bits of the address, giving the vendor 1,048,576 device addresses, a quarter of a full MA-L block. CEER NATIONAL AUTOMOTIVE COMPANY's block covers 1,048,576 addresses.
What devices use ACEF920?
Any network device with a MAC address starting AC:EF:92:0 was manufactured by or for CEER NATIONAL AUTOMOTIVE COMPANY.