Confidence: Medium · Source: FCC ULS · As of 2026-09-12
KF4DOC callsign genealogy
Currently held by Martin, Dennis 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 KF4DOC's current licensee, walking backwards.
- Martin, Dennis WKYgranted 2018-03-20cancelled 2025-05-30
Successor callsigns
Callsigns held now by people who previously held KF4DOC.
No current licensee on record previously held this callsign.
All historical holders
Every license row we've seen with the callsign KF4DOC, oldest first.
- ARMSTRONG, LOREN D FL2005-09-20 → cancelled 2017-09-26
- Martin, Dennis W KY2025-05-30 active