Confidence: Medium · Source: FCC ULS · As of 2026-09-14
KP4AJ callsign genealogy
Currently held by Rivera Rivera, Edfel J
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 KP4AJ's current licensee, walking backwards.
- Rivera Rivera, Edfel JPRgranted 2013-12-16cancelled 2014-02-22
Successor callsigns
Callsigns held now by people who previously held KP4AJ.
No current licensee on record previously held this callsign.
All historical holders
Every license row we've seen with the callsign KP4AJ, oldest first.
- GONZALEZ TORRES, CARLOS O PR1998-09-04 → cancelled 2010-09-08
- Rivera Rivera, Edfel J PR2023-11-28 active