Confidence: Medium · Source: FCC ULS · As of 2026-09-12
K9SCK callsign genealogy
Currently held by Karolek, Stephen C
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 K9SCK's current licensee, walking backwards.
- Karolek, Stephen CWIgranted 2021-03-29cancelled 2023-05-02
Successor callsigns
Callsigns held now by people who previously held K9SCK.
- Cooke, Edward JFLgranted 2021-02-23
All historical holders
Every license row we've seen with the callsign K9SCK, oldest first.
- Cooke, Edward J FL2019-10-08 → cancelled 2021-02-23
- Karolek, Stephen C WI2023-05-02 active