Confidence: Medium · Source: FCC ULS · As of 2026-09-12
KP4IX callsign genealogy
Currently held by IRIZARRY ARROYO, HERMENEGILD
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 KP4IX's current licensee, walking backwards.
Successor callsigns
Callsigns held now by people who previously held KP4IX.
No current licensee on record previously held this callsign.
All historical holders
Every license row we've seen with the callsign KP4IX, oldest first.
- IRIZARRY ARROYO, HERMENEGILD PR1991-03-05 → cancelled 2003-03-06
- APONTE SANTANA, SPARKY PR2022-03-19 active