Confidence: Medium · Source: FCC ULS · As of 2026-09-10
KB4RTO callsign genealogy
Currently held by Norona, Robert M
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 KB4RTO's current licensee, walking backwards.
- Norona, Robert MFLgranted 2025-11-22cancelled 2025-12-12
Successor callsigns
Callsigns held now by people who previously held KB4RTO.
No current licensee on record previously held this callsign.
All historical holders
Every license row we've seen with the callsign KB4RTO, oldest first.
- NORONA, ROBERT M FL1996-04-29 → cancelled 2008-04-30
- Norona, Robert M FL2025-12-12 active