Confidence: Medium · Source: FCC ULS · As of 2026-09-14
K4UGO callsign genealogy
Currently held by KIMBALL, JOHN GEORGE
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 K4UGO's current licensee, walking backwards.
- Ferreira Sr, Hugo BFLgranted 2024-02-13cancelled 2024-03-02
Successor callsigns
Callsigns held now by people who previously held K4UGO.
No current licensee on record previously held this callsign.
All historical holders
Every license row we've seen with the callsign K4UGO, oldest first.
- KIMBALL, JOHN GEORGE FL2005-05-03 → cancelled 2017-07-28
- Ferreira Sr, Hugo B FL2024-03-02 active