Confidence: Medium · Source: FCC ULS · As of 2026-09-12
KO4ST callsign genealogy
Currently held by Koch, Stuart A
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 KO4ST's current licensee, walking backwards.
- Koch, Stuart AVAgranted 2020-11-16cancelled 2021-04-10
Successor callsigns
Callsigns held now by people who previously held KO4ST.
- Koch, Stuart AVAgranted 2021-09-18
All historical holders
Every license row we've seen with the callsign KO4ST, oldest first.
- DE LA ROSA, PETER FL2001-11-28 → cancelled 2014-02-26
- Koch, Stuart A VA2021-04-10 → cancelled 2021-09-18