What this means
The IEEE assigned the MA-M block 4C4BF91 to Jiangsu acrel 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 4C:4B:F9:1, it is Jiangsu acrel Co., Ltd. hardware.
Frequently Asked Questions
Who owns MAC prefix 4C4BF91?
4C4BF91 is registered to Jiangsu acrel Co., Ltd. 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. Jiangsu acrel Co., Ltd.'s block covers 1,048,576 addresses.
What devices use 4C4BF91?
Any network device with a MAC address starting 4C:4B:F9:1 was manufactured by or for Jiangsu acrel Co., Ltd..