Confidence: Medium · Source: FCC ULS · As of 2026-09-14
KF4DCX callsign genealogy
Currently held by OSTHEIM, GARY F
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 KF4DCX's current licensee, walking backwards.
- Mozingo, Christel ONCgranted 2020-11-18cancelled 2020-12-11
Successor callsigns
Callsigns held now by people who previously held KF4DCX.
No current licensee on record previously held this callsign.
All historical holders
Every license row we've seen with the callsign KF4DCX, oldest first.
- OSTHEIM, GARY F SC2005-09-15 → cancelled 2017-09-16
- Mozingo, Christel O NC2020-12-11 active