Confidence: Medium · Source: FCC ULS · As of 2026-09-12
KY4SD callsign genealogy
Currently held by Dunning, Mark W
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 KY4SD's current licensee, walking backwards.
Successor callsigns
Callsigns held now by people who previously held KY4SD.
No current licensee on record previously held this callsign.