What this means
The IEEE assigned the MA-M block 8C51090 to TianJin JointOptic 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 8C:51:09:0, it is TianJin JointOptic Technology Co., LTD. hardware.
Frequently Asked Questions
Who owns MAC prefix 8C51090?
8C51090 is registered to TianJin JointOptic 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. TianJin JointOptic Technology Co., LTD.'s block covers 1,048,576 addresses.
What devices use 8C51090?
Any network device with a MAC address starting 8C:51:09:0 was manufactured by or for TianJin JointOptic Technology Co., LTD..