Confidence: Medium · Source: FCC ULS · As of 2026-09-12
KP4MS callsign genealogy
Currently held by MENDEZ MARRERO, SONIA
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 KP4MS's current licensee, walking backwards.
Successor callsigns
Callsigns held now by people who previously held KP4MS.
No current licensee on record previously held this callsign.
All historical holders
Every license row we've seen with the callsign KP4MS, oldest first.
- NOVOA LOPEZ, ISAAC PR2009-03-03 → cancelled 2021-03-16
- MENDEZ MARRERO, SONIA PR2025-07-19 active