Confidence: Medium · Source: FCC ULS · As of 2026-09-12
K4JBO callsign genealogy
Currently held by Johnson, Jason
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 K4JBO's current licensee, walking backwards.
- Johnson, JasonGAgranted 2024-01-26cancelled 2024-02-21
Successor callsigns
Callsigns held now by people who previously held K4JBO.
- OSBORN, JASON BFLgranted 2025-07-15
All historical holders
Every license row we've seen with the callsign K4JBO, oldest first.
- Osborn, Jason B FL2000-07-04 → cancelled 2005-08-30
- Johnson, Jason GA2024-02-21 active