Confidence: Medium · Source: FCC ULS · As of 2026-09-12
KC4SWO callsign genealogy
Currently held by GREGORY, DUNCAN B
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 KC4SWO's current licensee, walking backwards.
- Swoboda, David JVAgranted 2024-02-06cancelled 2024-03-01
Successor callsigns
Callsigns held now by people who previously held KC4SWO.
No current licensee on record previously held this callsign.
All historical holders
Every license row we've seen with the callsign KC4SWO, oldest first.
- GREGORY, DUNCAN B FL2000-11-04 → cancelled 2012-09-05
- Swoboda, David J VA2024-03-01 active