Who owns MAC prefix 4C4BF91?

4C4BF91 is registered to Jiangsu acrel Co., Ltd. in the IEEE MA-M registry.

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..

MA-M · OUI prefix

Jiangsu acrel Co., Ltd.

Any MAC address starting 4C:4B:F9:1 is registered to Jiangsu acrel Co., Ltd. in CN.

OUI prefix	4C4BF91
Vendor	Jiangsu acrel Co., Ltd.
Registry	MA-M (28-bit, medium block)
Country	CN
Example MAC	4C:4B:F9:1:00:00:00

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.

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