What this means
The IEEE assigned the MA-L block 345180 to TCL King Electrical Appliances (Huizhou) 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 34:51:80, it is TCL King Electrical Appliances (Huizhou) Co., Ltd hardware.