Confidence: Medium · Source: FCC ULS · As of 2026-09-14
WO1S callsign genealogy
Currently held by Kountz, John 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 WO1S's current licensee, walking backwards.
- Kountz, John CCAgranted 2004-01-02cancelled 2010-10-19
Successor callsigns
Callsigns held now by people who previously held WO1S.
No current licensee on record previously held this callsign.
All historical holders
Every license row we've seen with the callsign WO1S, oldest first.
- STUART II, FRANKLIN H MA1991-02-05 → cancelled 2003-02-06
- Kountz, John C AZ2020-08-20 active