Confidence: Medium · Source: FCC ULS · As of 2026-09-12
KB4JFB callsign genealogy
Currently held by Baldwin, John F
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 KB4JFB's current licensee, walking backwards.
- Baldwin, John FFLgranted 2021-05-25cancelled 2021-08-31
Successor callsigns
Callsigns held now by people who previously held KB4JFB.
No current licensee on record previously held this callsign.