Confidence: Medium · Source: FCC ULS · As of 2026-09-14
KN4EF callsign genealogy
Currently held by GREENE, JACK H
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 KN4EF's current licensee, walking backwards.
- Folk, Effie JNCgranted 2021-10-05cancelled 2022-02-15
- FULMER, JOHN RVAgranted 2024-01-06
- Moe, FrederickCAgranted 2026-01-27cancelled 2026-02-27
- Moe, FrederickCAgranted 2025-12-09cancelled 2026-01-27
- Moe, FrederickCAgranted 2025-09-09cancelled 2025-12-09
- Moe, FrederickCAgranted 2025-08-21cancelled 2025-09-09
Successor callsigns
Callsigns held now by people who previously held KN4EF.
No current licensee on record previously held this callsign.
All historical holders
Every license row we've seen with the callsign KN4EF, oldest first.
- GREENE, JACK H FL2003-03-06 → cancelled 2015-06-02
- FOLK, Effie J NC2022-02-15 active