Confidence: Medium · Source: FCC ULS · As of 2026-09-12
KY4DF callsign genealogy
Currently held by Rudolph, William A
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 KY4DF's current licensee, walking backwards.
- Rudolph, William ATNgranted 2020-08-19cancelled 2020-12-14
Successor callsigns
Callsigns held now by people who previously held KY4DF.
No current licensee on record previously held this callsign.