What this means

The IEEE assigned the MA-L block E05DA6 to Detlef Fink Elektronik & Softwareentwicklung. 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 E0:5D:A6, it is Detlef Fink Elektronik & Softwareentwicklung hardware.