Confidence: Medium · Source: FCC ULS · As of 2026-09-12
KC9ABC callsign genealogy
Currently held by Thatcher, Treber J
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 KC9ABC's current licensee, walking backwards.
- Stilwell, Dan DWIgranted 2015-11-07cancelled 2018-05-22
Successor callsigns
Callsigns held now by people who previously held KC9ABC.
No current licensee on record previously held this callsign.
All historical holders
Every license row we've seen with the callsign KC9ABC, oldest first.
- Thatcher, Treber J IL2001-07-30 → cancelled 2013-07-31
- Stilwell, Dan D WI2018-05-22 active