Confidence: Medium · Source: FCC ULS · As of 2026-09-12
KP4YA callsign genealogy
Currently held by OSORIO FEBRES, CARLOS 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 KP4YA's current licensee, walking backwards.
- WP4LUHno FCC ULS record on file
Successor callsigns
Callsigns held now by people who previously held KP4YA.
- OSORIO, CARLOS MPRgranted 2020-05-21