Confidence: Medium · Source: FCC ULS · As of 2026-09-12
AF4FX callsign genealogy
Currently held by CASTRO, JORGE H
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 AF4FX's current licensee, walking backwards.
- CASTRO, JORGE HFLgranted 2007-01-22cancelled 2010-04-02
Successor callsigns
Callsigns held now by people who previously held AF4FX.
No current licensee on record previously held this callsign.
All historical holders
Every license row we've seen with the callsign AF4FX, oldest first.
- KING, WILLIAM S FL1997-10-10 → cancelled 2007-04-05
- CASTRO, JORGE H TX2020-02-03 active