Confidence: Medium · Source: FCC ULS · As of 2026-09-14
KO4BSO callsign genealogy
Currently held by ZEIGLER, JAMES J
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 KO4BSO's current licensee, walking backwards.
The current licensee has not held any other callsign on record.
Successor callsigns
Callsigns held now by people who previously held KO4BSO.
- ZEIGLER, JAMES JSCgranted 2020-04-14