Confidence: Medium · Source: FCC ULS · As of 2026-09-12
KK4FJS callsign genealogy
Currently held by BUTLER, CHRISTOPHER R
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 KK4FJS's current licensee, walking backwards.
- Sabio, FernandoVAgranted 2024-04-16cancelled 2024-05-04
Successor callsigns
Callsigns held now by people who previously held KK4FJS.
No current licensee on record previously held this callsign.
All historical holders
Every license row we've seen with the callsign KK4FJS, oldest first.
- BUTLER, CHRISTOPHER R VA2011-11-18 → cancelled 2023-11-21
- Sabio, Fernando VA2024-05-04 active