What this means
The IEEE assigned the MA-L block F40393 to Nanjing Qinheng Microelectronics 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 F4:03:93, it is Nanjing Qinheng Microelectronics Co., Ltd. hardware.
Frequently Asked Questions
Who owns MAC prefix F40393?
F40393 is registered to Nanjing Qinheng Microelectronics 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. Nanjing Qinheng Microelectronics Co., Ltd.'s block covers 16,777,216 addresses.
What devices use F40393?
Any network device with a MAC address starting F4:03:93 was manufactured by or for Nanjing Qinheng Microelectronics Co., Ltd..