Confidence: Medium · Source: FCC ULS · As of 2026-09-12
AC6OS callsign genealogy
Currently held by CASTEEN JR, WILLIAM F
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 AC6OS's current licensee, walking backwards.
- KB6JKDno FCC ULS record on file
Successor callsigns
Callsigns held now by people who previously held AC6OS.
- CASTEEN JR, WILLIAM FCAgranted 2022-02-08