What this means

The IEEE assigned the MA-M block EC9A0C0 to SHENZHEN HEXINDA SUPPLY CHAIN MANAGEMENT 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 EC:9A:0C:0, it is SHENZHEN HEXINDA SUPPLY CHAIN MANAGEMENT CO.LTD hardware.