Confidence: Medium · Source: FCC ULS · As of 2026-09-14
K4EFI callsign genealogy
Currently held by Clark, David 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 K4EFI's current licensee, walking backwards.
- Kaps, Timothy RVAgranted 2019-02-26cancelled 2019-05-14
Successor callsigns
Callsigns held now by people who previously held K4EFI.
- Clark, David JKYgranted 2026-05-19
All historical holders
Every license row we've seen with the callsign K4EFI, oldest first.
- Clark, David J KY2007-04-28 → cancelled 2016-07-01
- Kaps, Timothy R VA2019-05-14 active