What this means
The IEEE assigned the MA-M block 54083B0 to Shenzhen Liandian Communication Technology 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 54:08:3B:0, it is Shenzhen Liandian Communication Technology Co.LTD hardware.