Confidence: Medium · Source: FCC ULS · As of 2026-09-12
K0TX callsign genealogy
Currently held by Grisak, Denis
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 K0TX's current licensee, walking backwards.
Successor callsigns
Callsigns held now by people who previously held K0TX.
No current licensee on record previously held this callsign.
All historical holders
Every license row we've seen with the callsign K0TX, oldest first.
- MATHIAS, RAY M IA2008-10-31 → cancelled 2021-01-29
- Grisak, Denis CO2021-02-17 active