Confidence: Medium · Source: FCC ULS · As of 2026-09-14
KO9Q callsign genealogy
Currently held by Ciesiolka, Michael
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 KO9Q's current licensee, walking backwards.
- Ciesiolka, Michael AINgranted 2007-11-30cancelled 2013-01-29
Successor callsigns
Callsigns held now by people who previously held KO9Q.
No current licensee on record previously held this callsign.
All historical holders
Every license row we've seen with the callsign KO9Q, oldest first.
- FILIPIAK, MICHAEL E WI1997-02-11 → cancelled 2009-02-12
- Ciesiolka, Michael IN2023-12-12 active