What this means
The IEEE assigned the MA-L block B4CFDB to Shenzhen Jiuzhou Electric 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:CF:DB, it is Shenzhen Jiuzhou Electric Co.,LTD hardware.
Frequently Asked Questions
Who owns MAC prefix B4CFDB?
B4CFDB is registered to Shenzhen Jiuzhou Electric 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 Jiuzhou Electric Co.,LTD's block covers 16,777,216 addresses.
What devices use B4CFDB?
Any network device with a MAC address starting B4:CF:DB was manufactured by or for Shenzhen Jiuzhou Electric Co.,LTD.