Confidence: Medium · Source: FCC ULS · As of 2026-09-12
KY4OS callsign genealogy
Currently held by Alcaraz, Mario N
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 KY4OS's current licensee, walking backwards.
- Alcaraz, Mario NKYgranted 2021-03-16cancelled 2022-04-21
Successor callsigns
Callsigns held now by people who previously held KY4OS.
No current licensee on record previously held this callsign.