Confidence: Medium · Source: FCC ULS · As of 2026-09-14
KO4BI callsign genealogy
Currently held by KRATZ, BRUCE S
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 KO4BI'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 KO4BI.
- KRATZ, BRUCE SKYgranted 2012-12-05cancelled 2025-01-08