Confidence: Medium · Source: FCC ULS · As of 2026-09-14
KY4DU callsign genealogy
Currently held by Frame Jr, Charles J
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 KY4DU's current licensee, walking backwards.
The current licensee has not held any other callsign on record.
Successor callsigns
Callsigns held now by people who previously held KY4DU.
- Frame Jr, Charles JVAgranted 2021-03-19