Confidence: Medium · Source: FCC ULS · As of 2026-09-14
KF4JJF callsign genealogy
Currently held by Friedman, Justin J
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 KF4JJF's current licensee, walking backwards.
- Friedman, Justin JVAgranted 2022-04-05cancelled 2022-04-26
Successor callsigns
Callsigns held now by people who previously held KF4JJF.
No current licensee on record previously held this callsign.
All historical holders
Every license row we've seen with the callsign KF4JJF, oldest first.
- ESTEP, WILLIAM C KY2006-11-02 → cancelled 2018-05-08
- Friedman, Justin J VA2022-04-26 active