What this means
The IEEE assigned the MA-L block 503D7F to Nokia Shanghai Bell 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 50:3D:7F, it is Nokia Shanghai Bell Co., Ltd. hardware.
Frequently Asked Questions
Who owns MAC prefix 503D7F?
503D7F is registered to Nokia Shanghai Bell 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. Nokia Shanghai Bell Co., Ltd.'s block covers 16,777,216 addresses.
What devices use 503D7F?
Any network device with a MAC address starting 50:3D:7F was manufactured by or for Nokia Shanghai Bell Co., Ltd..