What this means
The IEEE assigned the MA-L block B43939 to Shenzhen TINNO Mobile Technology Corp.. 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 B4:39:39, it is Shenzhen TINNO Mobile Technology Corp. hardware.
Frequently Asked Questions
Who owns MAC prefix B43939?
B43939 is registered to Shenzhen TINNO Mobile Technology Corp. 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 TINNO Mobile Technology Corp.'s block covers 16,777,216 addresses.
What devices use B43939?
Any network device with a MAC address starting B4:39:39 was manufactured by or for Shenzhen TINNO Mobile Technology Corp..