Confidence: Medium · Source: FCC ULS · As of 2026-09-12
KF4SOY callsign genealogy
Currently held by VALDES, YOID R
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 KF4SOY's current licensee, walking backwards.
- VALDES, YOID RFLgranted 2020-07-24cancelled 2020-08-11
Successor callsigns
Callsigns held now by people who previously held KF4SOY.
No current licensee on record previously held this callsign.
All historical holders
Every license row we've seen with the callsign KF4SOY, oldest first.
- VALDES, RAUL F FL2007-05-09 → cancelled 2019-06-19
- VALDES, YOID R FL2020-08-11 active