Confidence: Medium · Source: FCC ULS · As of 2026-09-12
N1SLS callsign genealogy
Currently held by Hart, Mike
The FCC publishes a previous_call_sign on
every amateur license — a self-link to the licensee's prior callsign.
Following those links produces the chain below.
Previous callsigns
Older callsigns held by N1SLS's current licensee, walking backwards.
- Hart, MikeUTgranted 2025-02-06cancelled 2025-02-25
Successor callsigns
Callsigns held now by people who previously held N1SLS.
- MC DONALD, RICHARD EALgranted 1998-03-16cancelled 2002-08-06
All historical holders
Every license row we've seen with the callsign N1SLS, oldest first.
- Hart, Mike UT2025-02-25 active
- MC DONALD, RICHARD E— → cancelled 1998-03-16