Confidence: Medium · Source: FCC ULS · As of 2026-09-12
KB9GTS callsign genealogy
Currently held by ZUMBRUN, DOUGLAS S
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 KB9GTS's current licensee, walking backwards.
- Zumbrun, Douglas SINgranted 2005-09-23cancelled 2006-04-18
Successor callsigns
Callsigns held now by people who previously held KB9GTS.
No current licensee on record previously held this callsign.
All historical holders
Every license row we've seen with the callsign KB9GTS, oldest first.
- ZUMBRUN, DOUGLAS S IN1999-02-19 → cancelled 2004-07-22
- ZUMBRUN, DOUGLAS S IN2018-03-13 active