Confidence: Medium · Source: FCC ULS · As of 2026-09-12
KC8TH callsign genealogy
Currently held by HEYBOER, THOMAS W
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 KC8TH's current licensee, walking backwards.
- HEYBOER, THOMAS WMIgranted 2008-09-27cancelled 2010-11-30
Successor callsigns
Callsigns held now by people who previously held KC8TH.
No current licensee on record previously held this callsign.
All historical holders
Every license row we've seen with the callsign KC8TH, oldest first.
- SATO, RYOSUKE AZ1990-05-01 → cancelled 2002-05-02
- HEYBOER, THOMAS W MI2020-09-03 active