Confidence: Medium · Source: FCC ULS · As of 2026-09-12
AC4UR callsign genealogy
Currently held by BYRD, MICHAEL B
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 AC4UR's current licensee, walking backwards.
- BYRD, MICHAEL BFLgranted 1994-07-14cancelled 2002-03-07
Successor callsigns
Callsigns held now by people who previously held AC4UR.
No current licensee on record previously held this callsign.
All historical holders
Every license row we've seen with the callsign AC4UR, oldest first.
- BYRD, MICHAEL B FL2022-02-08 active
- —— → cancelled 1997-08-08