What this means
The IEEE assigned the MA-M block 500B91E to Shenzhen zhong ju Fiber optical 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 50:0B:91:E, it is Shenzhen zhong ju Fiber optical Co.Ltd hardware.
Frequently Asked Questions
Who owns MAC prefix 500B91E?
500B91E is registered to Shenzhen zhong ju Fiber optical 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. Shenzhen zhong ju Fiber optical Co.Ltd's block covers 1,048,576 addresses.
What devices use 500B91E?
Any network device with a MAC address starting 50:0B:91:E was manufactured by or for Shenzhen zhong ju Fiber optical Co.Ltd.