What this means

The IEEE assigned the MA-L block 001528 to Beacon Medical Products LLC d.b.a. BeaconMedaes. 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 00:15:28, it is Beacon Medical Products LLC d.b.a. BeaconMedaes hardware.