Confidence: Medium · Source: FCC ULS · As of 2026-09-12
KB4UOJ callsign genealogy
Currently held by Tainio, Robert 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 KB4UOJ's current licensee, walking backwards.
- Tainio, Robert FNCgranted 2026-02-14cancelled 2026-03-10
Successor callsigns
Callsigns held now by people who previously held KB4UOJ.
No current licensee on record previously held this callsign.