Confidence: Medium · Source: FCC ULS · As of 2026-09-12
K4CTX callsign genealogy
Currently held by UPPERMAN, ALAN E
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 K4CTX's current licensee, walking backwards.
- CARR, GEOFFREY RFLgranted 2013-06-05cancelled 2022-05-27
Successor callsigns
Callsigns held now by people who previously held K4CTX.
No current licensee on record previously held this callsign.
All historical holders
Every license row we've seen with the callsign K4CTX, oldest first.
- UPPERMAN, ALAN E VA2010-01-22 → cancelled 2022-01-25
- CARR, GEOFFREY R FL2022-05-27 active