Confidence: Medium · Source: FCC ULS · As of 2026-09-12
K0SGT callsign genealogy
Currently held by Trehal, Russell E
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 K0SGT's current licensee, walking backwards.
- Trehal, Russell EMOgranted 2016-10-24cancelled 2024-11-13
Successor callsigns
Callsigns held now by people who previously held K0SGT.
- Parz, WillAZgranted 2021-03-09
All historical holders
Every license row we've seen with the callsign K0SGT, oldest first.
- LYON, JOHN E MO2003-09-25 → cancelled 2015-12-01
- Parz, Will NC2020-07-21 → cancelled 2021-03-09
- Trehal, Russell E MO2024-11-13 active