What this means
The IEEE assigned the MA-M block 7C45F91 to Hunan Shengyun Photoelectric Technology 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 7C:45:F9:1, it is Hunan Shengyun Photoelectric Technology Co., LTD hardware.
Frequently Asked Questions
Who owns MAC prefix 7C45F91?
7C45F91 is registered to Hunan Shengyun Photoelectric Technology 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. Hunan Shengyun Photoelectric Technology Co., LTD's block covers 1,048,576 addresses.
What devices use 7C45F91?
Any network device with a MAC address starting 7C:45:F9:1 was manufactured by or for Hunan Shengyun Photoelectric Technology Co., LTD.