Confidence: Medium · Source: FCC ULS · As of 2026-09-11
K8SWF callsign genealogy
Currently held by Shirko, Roger P
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 K8SWF's current licensee, walking backwards.
- Warnock, StephenOHgranted 2021-01-25cancelled 2021-02-17
Successor callsigns
Callsigns held now by people who previously held K8SWF.
No current licensee on record previously held this callsign.
All historical holders
Every license row we've seen with the callsign K8SWF, oldest first.
- Shirko, Roger P FL2015-02-20 → cancelled 2018-09-12
- Warnock, Stephen OH2021-02-17 active