Confidence: Medium · Source: FCC ULS · As of 2026-09-12
AB4GX callsign genealogy
Currently held by De Castro, Guarionex
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 AB4GX's current licensee, walking backwards.
- De Castro, GuarionexFLgranted 2022-03-22cancelled 2023-02-22
Successor callsigns
Callsigns held now by people who previously held AB4GX.
- KEMSKI, KENNETH CFLgranted 2011-08-06cancelled 2023-09-23
All historical holders
Every license row we've seen with the callsign AB4GX, oldest first.
- KEMSKI, KENNETH C FL2000-03-18 → cancelled 2001-09-22
- De Castro, Guarionex FL2023-02-22 active