Confidence: Medium · Source: FCC ULS · As of 2026-09-12
AB4NO callsign genealogy
Currently held by BUTLER, WARREN R
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 AB4NO's current licensee, walking backwards.
- Beach, Matthew CALgranted 2016-01-11cancelled 2016-05-27
Successor callsigns
Callsigns held now by people who previously held AB4NO.
No current licensee on record previously held this callsign.
All historical holders
Every license row we've seen with the callsign AB4NO, oldest first.
- BUTLER, WARREN R FL1998-11-20 → cancelled 2010-11-23
- Beach, Matthew C AL2026-06-04 active