What this means
The IEEE assigned the MA-L block 30A3B5 to Jiangsu Best Tone Information Service 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 30:A3:B5, it is Jiangsu Best Tone Information Service Co., Ltd hardware.
Frequently Asked Questions
Who owns MAC prefix 30A3B5?
30A3B5 is registered to Jiangsu Best Tone Information Service 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. Jiangsu Best Tone Information Service Co., Ltd's block covers 16,777,216 addresses.
What devices use 30A3B5?
Any network device with a MAC address starting 30:A3:B5 was manufactured by or for Jiangsu Best Tone Information Service Co., Ltd.