Confidence: Medium · Source: FCC ULS · As of 2026-09-12
KB4SDR callsign genealogy
Currently held by Sociedad Dominicana De Radioaficionados
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 KB4SDR's current licensee, walking backwards.
- KR4BJIcancelledSociedad Dominicana De RadioaficionadosFLgranted 2025-02-13cancelled 2025-03-04
Successor callsigns
Callsigns held now by people who previously held KB4SDR.
No current licensee on record previously held this callsign.
All historical holders
Every license row we've seen with the callsign KB4SDR, oldest first.
- RICCOBONO, PHILIP J FL1997-08-26 → cancelled 2009-08-27
- Sociedad Dominicana De Radioaficionados FL2025-03-04 active