Confidence: Medium · Source: FCC ULS · As of 2026-09-12
AB4MA callsign genealogy
Currently held by MADIGAN, MICHAEL J
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 AB4MA's current licensee, walking backwards.
Successor callsigns
Callsigns held now by people who previously held AB4MA.
No current licensee on record previously held this callsign.
All historical holders
Every license row we've seen with the callsign AB4MA, oldest first.
- MADIGAN, MICHAEL J FL1998-08-20 → cancelled 2010-08-21
- Abma, Curtis M MO2025-02-19 active