Confidence: Medium · Source: FCC ULS · As of 2026-09-14
K9CQW callsign genealogy
Currently held by Winthurst, Mark
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 K9CQW's current licensee, walking backwards.
- Winthurst, MarkILgranted 2014-12-04cancelled 2015-02-24
Successor callsigns
Callsigns held now by people who previously held K9CQW.
No current licensee on record previously held this callsign.
All historical holders
Every license row we've seen with the callsign K9CQW, oldest first.
- GREINER, TED F IN1988-02-02 → cancelled 2000-02-03
- Winthurst, Mark IL2024-11-30 active