Confidence: Medium · Source: FCC ULS · As of 2026-09-14
KZ0X callsign genealogy
Currently held by Colonder II, John H
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 KZ0X's current licensee, walking backwards.
- Colonder II, John HMOgranted 2026-01-24
Successor callsigns
Callsigns held now by people who previously held KZ0X.
- Colonder II, John HMOgranted 2026-01-24
All historical holders
Every license row we've seen with the callsign KZ0X, oldest first.
- SELL, KENNETH A AZ2010-07-14 → cancelled 2022-09-13
- Colonder II, John H MO2022-09-30 → cancelled 2026-01-24