Confidence: Medium · Source: FCC ULS · As of 2026-09-14
KC6JAY callsign genealogy
Currently held by Osorio, Jason B
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 KC6JAY's current licensee, walking backwards.
- Osorio, Jason BCAgranted 2013-05-20cancelled 2022-08-05
Successor callsigns
Callsigns held now by people who previously held KC6JAY.
No current licensee on record previously held this callsign.
All historical holders
Every license row we've seen with the callsign KC6JAY, oldest first.
- ZACKS, CHARLES S CA1990-02-27 → cancelled 2002-03-07
- Osorio, Jason B CA2022-08-05 active