If you are running your own receiver, you should see them on your map, especially if you are part of a MLAT network for calculating position data for aircraft t

If you are running your own receiver, you should see them on your map, especially if you are part of a MLAT network for calculating position data for aircraft that only transmit Mode-S data. The key issue is ICAO hex to aircraft mappings, and there you'll need to either do a lookup against (often commercial APIs) or build your own registration database from public data.