Confidence: Medium · Source: FCC ULS · As of 2026-09-14
K4DUK callsign genealogy
Currently held by Ducksworth, Frederic
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 K4DUK's current licensee, walking backwards.
Successor callsigns
Callsigns held now by people who previously held K4DUK.
No current licensee on record previously held this callsign.
All historical holders
Every license row we've seen with the callsign K4DUK, oldest first.
- DUCK, ROBERT E NC2014-04-26 → cancelled 2026-07-14
- Ducksworth, Frederic FL2026-08-11 active