Confidence: Medium · Source: FCC ULS · As of 2026-09-14
KO4QX callsign genealogy
Currently held by MULLER, GERRY 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 KO4QX's current licensee, walking backwards.
- MULLER, GERRY WFLgranted 2003-09-25cancelled 2011-11-18
Successor callsigns
Callsigns held now by people who previously held KO4QX.
- MULLER, GERRY WFLgranted 2003-09-25cancelled 2011-11-18
All historical holders
Every license row we've seen with the callsign KO4QX, oldest first.
- MULLER, GERRY W TX1999-04-30 → cancelled 2000-05-16
- MULLER, GERRY W FL2011-11-18 → cancelled 2023-11-21