Confidence: Medium · Source: FCC ULS · As of 2026-09-12
K0STR callsign genealogy
Currently held by Koster, David N
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 K0STR's current licensee, walking backwards.
- Stone, Russell ICOgranted 2021-03-15cancelled 2021-04-02
Successor callsigns
Callsigns held now by people who previously held K0STR.
No current licensee on record previously held this callsign.
All historical holders
Every license row we've seen with the callsign K0STR, oldest first.
- Koster, David N CO2005-09-07 → cancelled 2017-09-08
- Stone, Russell I CO2021-04-02 active