Confidence: Medium · Source: FCC ULS · As of 2026-09-12
K6OB callsign genealogy
Currently held by Casteen, 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 K6OB's current licensee, walking backwards.
- CASTEEN JR, WILLIAM FCAgranted 2012-01-23cancelled 2012-03-23
- KB6JKDno FCC ULS record on file
Successor callsigns
Callsigns held now by people who previously held K6OB.
No current licensee on record previously held this callsign.
All historical holders
Every license row we've seen with the callsign K6OB, oldest first.
- Casteen, William F CA2003-12-23 → cancelled 2011-03-26
- CASTEEN JR, WILLIAM F CA2022-02-08 active