Confidence: Medium · Source: FCC ULS · As of 2026-09-11
KB4OSX callsign genealogy
Currently held by MARTIN, BRADLEY D
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 KB4OSX's current licensee, walking backwards.
- Martin, Bradley DFLgranted 2022-01-13cancelled 2022-02-01
Successor callsigns
Callsigns held now by people who previously held KB4OSX.
No current licensee on record previously held this callsign.
All historical holders
Every license row we've seen with the callsign KB4OSX, oldest first.
- MARTIN, BRADLEY D FL1996-01-22 → cancelled 2008-01-23
- Martin, Bradley D FL2022-02-01 active