Confidence: Medium · Source: FCC ULS · As of 2026-09-14
N4SDL callsign genealogy
Currently held by RIVERS SR, JOHN W
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 N4SDL's current licensee, walking backwards.
- DIXON, JOHNKYgranted 2022-04-11cancelled 2024-03-26
Successor callsigns
Callsigns held now by people who previously held N4SDL.
No current licensee on record previously held this callsign.
All historical holders
Every license row we've seen with the callsign N4SDL, oldest first.
- RIVERS SR, JOHN W FL1991-03-19 → cancelled 2003-03-20
- DIXON, JOHN KY2024-03-26 active