Confidence: Medium · Source: FCC ULS · As of 2026-09-14
K4JWB callsign genealogy
Currently held by GROCHAL, FRANK Z
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 K4JWB's current licensee, walking backwards.
- Bailey, JonathanFLgranted 2024-02-10cancelled 2024-03-05
Successor callsigns
Callsigns held now by people who previously held K4JWB.
No current licensee on record previously held this callsign.
All historical holders
Every license row we've seen with the callsign K4JWB, oldest first.
- GROCHAL, FRANK Z FL1995-08-02 → cancelled 2007-08-03
- BAKER, JOHN W AL2008-05-30 → cancelled 2020-06-01
- Bailey, Jonathan FL2024-03-05 active