Confidence: Medium · Source: FCC ULS · As of 2026-09-14
KO4JON callsign genealogy
Currently held by Beard, Jonathan J
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 KO4JON's current licensee, walking backwards.
- Beard, Jonathan JFLgranted 2026-05-05cancelled 2026-05-27
Successor callsigns
Callsigns held now by people who previously held KO4JON.
- Joseph, JackNCgranted 2020-12-19cancelled 2023-12-27
All historical holders
Every license row we've seen with the callsign KO4JON, oldest first.
- Joseph, Jack NC2020-11-19 → cancelled 2020-12-19
- Beard, Jonathan J FL2026-05-27 active