Confidence: Medium · Source: FCC ULS · As of 2026-09-14
K4OZI callsign genealogy
Currently held by FREDERICK, JEFF 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 K4OZI's current licensee, walking backwards.
- Frederick, Devin AKYgranted 2019-05-20cancelled 2019-06-08
Successor callsigns
Callsigns held now by people who previously held K4OZI.
No current licensee on record previously held this callsign.
All historical holders
Every license row we've seen with the callsign K4OZI, oldest first.
- HAMMONS, ARTHUR D KY1994-08-15 → cancelled 2004-07-04
- FREDERICK, JEFF A KY2004-09-14 → cancelled 2016-09-15
- Frederick, Devin A KY2019-06-08 active