What this means
The IEEE assigned the MA-L block A8D3C8 to Wachendorff Automation GmbH & CO.KG. 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 A8:D3:C8, it is Wachendorff Automation GmbH & CO.KG hardware.