What this means
The IEEE assigned the MA-M block A0024A5 to Dongguan Amsamotion Automation 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 A0:02:4A:5, it is Dongguan Amsamotion Automation Technology Co., Ltd hardware.