Confidence: Medium · Source: FCC ULS · As of 2026-09-12
KB4FX callsign genealogy
Currently held by WATSON, FRANK M
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 KB4FX's current licensee, walking backwards.
- Birdine, Kristian LTNgranted 2019-11-19cancelled 2020-01-24
Successor callsigns
Callsigns held now by people who previously held KB4FX.
No current licensee on record previously held this callsign.
All historical holders
Every license row we've seen with the callsign KB4FX, oldest first.
- WATSON, FRANK M AL1998-08-25 → cancelled 2010-08-26
- Birdine, Kristian L TN2020-01-24 active