Confidence: Medium · Source: FCC ULS · As of 2026-10-29
N4TXT callsign genealogy
Currently held by Castiblanco, John
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 N4TXT's current licensee, walking backwards.
- Castiblanco, JohnTXgranted 2025-08-12cancelled 2026-10-23
Successor callsigns
Callsigns held now by people who previously held N4TXT.
No current licensee on record previously held this callsign.
All historical holders
Every license row we've seen with the callsign N4TXT, oldest first.
- Stocky, DOROTHY G FL2011-05-12 → cancelled 2023-05-13
- Castiblanco, John TX2026-10-23 active