Confidence: Medium · Source: FCC ULS · As of 2026-09-12
KA0OSY callsign genealogy
Currently held by Gassmann, Francis
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 KA0OSY's current licensee, walking backwards.
- Gassmann, FrancisKSgranted 2022-08-16cancelled 2022-09-07
Successor callsigns
Callsigns held now by people who previously held KA0OSY.
No current licensee on record previously held this callsign.
All historical holders
Every license row we've seen with the callsign KA0OSY, oldest first.
- GASSMANN, FRANCIS J KS1988-06-14 → cancelled 2000-06-15
- Gassmann, Francis KS2022-09-07 active