Confidence: Medium · Source: FCC ULS · As of 2026-09-12
KO5S callsign genealogy
Currently held by Warnol, Craig
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 KO5S's current licensee, walking backwards.
- Warnol, Craig AMSgranted 2012-04-24cancelled 2014-12-06
Successor callsigns
Callsigns held now by people who previously held KO5S.
- GOLDEN, FRANK CMSgranted 2012-11-17cancelled 2021-07-30
All historical holders
Every license row we've seen with the callsign KO5S, oldest first.
- GOLDEN, FRANK C MS2011-09-17 → cancelled 2012-11-17
- Warnol, Craig MS2024-09-10 active