What this means
The IEEE assigned the MA-L block 307512 to Sony Corporation. 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 30:75:12, it is Sony Corporation hardware.
Frequently Asked Questions
Who owns MAC prefix 307512?
307512 is registered to Sony Corporation 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. Sony Corporation's block covers 16,777,216 addresses.
What devices use 307512?
Any network device with a MAC address starting 30:75:12 was manufactured by or for Sony Corporation.