What this means
The IEEE assigned the MA-L block 2057AF to Shenzhen FH-NET OPTOELECTRONICS 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 20:57:AF, it is Shenzhen FH-NET OPTOELECTRONICS CO.,LTD hardware.
Frequently Asked Questions
Who owns MAC prefix 2057AF?
2057AF is registered to Shenzhen FH-NET OPTOELECTRONICS CO.,LTD in the IEEE MA-L registry.
What does the MA-L registry type mean?
An MA-L assignment, the IEEE's original OUI format, gives the vendor the first three octets and 16,777,216 device addresses under them. Shenzhen FH-NET OPTOELECTRONICS CO.,LTD's block covers 16,777,216 addresses.
What devices use 2057AF?
Any network device with a MAC address starting 20:57:AF was manufactured by or for Shenzhen FH-NET OPTOELECTRONICS CO.,LTD.