Confidence: Medium · Source: FCC ULS · As of 2026-09-12
N9QDX callsign genealogy
Currently held by KOOYENGA, HENRY 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 N9QDX's current licensee, walking backwards.
- Greenen, Gerald AILgranted 2007-08-23cancelled 2016-01-30
Successor callsigns
Callsigns held now by people who previously held N9QDX.
- KOOYENGA, HENRY AILgranted 2017-09-19
All historical holders
Every license row we've seen with the callsign N9QDX, oldest first.
- GREENEN, GERALD A IL2025-12-24 active
- KOOYENGA, HENRY A— → cancelled 1997-09-17