Confidence: Medium · Source: FCC ULS · As of 2026-09-12
KB9TC callsign genealogy
Currently held by Irwin, John C
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 KB9TC's current licensee, walking backwards.
- CHAPMAN, TIMOTHY DMIgranted 2008-03-11cancelled 2017-04-14
Successor callsigns
Callsigns held now by people who previously held KB9TC.
- IRWIN, JOHN CWIgranted 2016-05-18
All historical holders
Every license row we've seen with the callsign KB9TC, oldest first.
- Irwin, John C WI2005-11-29 → cancelled 2006-07-25
- CHAPMAN, TIMOTHY D MI2017-04-14 active