What this means
The IEEE assigned the MA-L block B40566 to SP Best Corporation 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 B4:05:66, it is SP Best Corporation Co., LTD. hardware.
Frequently Asked Questions
Who owns MAC prefix B40566?
B40566 is registered to SP Best Corporation 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. SP Best Corporation Co., LTD.'s block covers 16,777,216 addresses.
What devices use B40566?
Any network device with a MAC address starting B4:05:66 was manufactured by or for SP Best Corporation Co., LTD..