Confidence: Medium · Source: FCC ULS · As of 2026-09-12
KP4JM callsign genealogy
Currently held by MASSO, JOSE M
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 KP4JM's current licensee, walking backwards.
Successor callsigns
Callsigns held now by people who previously held KP4JM.
- FUENTES, JORGE LFLgranted 2022-07-22
All historical holders
Every license row we've seen with the callsign KP4JM, oldest first.
- FUENTES, JORGE L CT2010-12-21 → cancelled 2012-06-22
- MASSO, JOSE M PR2024-05-23 active