What this means
The IEEE assigned the MA-L block 3C591E 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 3C:59:1E, it is TCL King Electrical Appliances (Huizhou) Co., Ltd hardware.