Confidence: Medium · Source: FCC ULS · As of 2026-09-14
KF4JFK callsign genealogy
Currently held by Kwiatkowski, Jeffrey F
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 KF4JFK's current licensee, walking backwards.
- Kwiatkowski, Jeffrey FNCgranted 2024-09-04cancelled 2025-12-09
Successor callsigns
Callsigns held now by people who previously held KF4JFK.
- Kwiatkowski, Jeffrey FNCgranted 2026-01-09
All historical holders
Every license row we've seen with the callsign KF4JFK, oldest first.
- NICHOLSON, DANIEL A TN2006-01-31 → cancelled 2018-05-02
- Kwiatkowski, Jeffrey F NC2025-12-09 → cancelled 2026-01-09