Confidence: Medium · Source: FCC ULS · As of 2026-09-12
KF4GS callsign genealogy
Currently held by HAGAN, JEFF S
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 KF4GS's current licensee, walking backwards.
- Sparks, Gregory GILgranted 2025-02-20cancelled 2025-04-22
Successor callsigns
Callsigns held now by people who previously held KF4GS.
- HAGAN, JEFF SFLgranted 2021-04-12
All historical holders
Every license row we've seen with the callsign KF4GS, oldest first.
- HAGAN, JEFF S FL1991-07-09 → cancelled 2001-05-05
- Sparks, Gregory G IL2025-04-22 active