Confidence: Medium · Source: FCC ULS · As of 2026-09-12
KP4CT callsign genealogy
Currently held by TORRES DE ARCE, CESAR
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 KP4CT's current licensee, walking backwards.
- TORRES DE ARCE, CESARPRgranted 2016-09-19cancelled 2022-10-18
Successor callsigns
Callsigns held now by people who previously held KP4CT.
- KP4BDactiveLas Piedras DX GroupPRgranted 2019-07-19
All historical holders
Every license row we've seen with the callsign KP4CT, oldest first.
- SANCHEZ GIRONA, ALFONSO PR1987-09-22 → cancelled 1999-09-23
- Las Piedras DX Group PR2017-06-02 → cancelled 2019-07-19
- TORRES DE ARCE, CESAR PR2022-10-18 active