Confidence: Medium · Source: FCC ULS · As of 2026-09-12
KO4FX callsign genealogy
Currently held by Rushton, Ethan T
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 KO4FX's current licensee, walking backwards.
- Rushton, Ethan TTNgranted 2022-01-10cancelled 2024-12-13
Successor callsigns
Callsigns held now by people who previously held KO4FX.
No current licensee on record previously held this callsign.
All historical holders
Every license row we've seen with the callsign KO4FX, oldest first.
- NIEDS, JEROME A FL1991-08-06 → cancelled 2003-08-07
- Rushton, Ethan T TN2024-12-13 active