Confidence: Medium · Source: FCC ULS · As of 2026-09-14
K0SKY callsign genealogy
Currently held by YAROS, RONALD A
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 K0SKY's current licensee, walking backwards.
- Han, WilliamCAgranted 2006-11-02cancelled 2007-03-20
Successor callsigns
Callsigns held now by people who previously held K0SKY.
- YAROS, RONALD AMDgranted 2014-08-19cancelled 2021-07-20
All historical holders
Every license row we've seen with the callsign K0SKY, oldest first.
- YAROS, RONALD A WI1999-05-26 → cancelled 2004-11-16
- HAN, WILLIAM CA2017-01-31 active