Confidence: Medium · Source: FCC ULS · As of 2026-09-12
N4BJM callsign genealogy
Currently held by Madigan Jr, William 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 N4BJM's current licensee, walking backwards.
- Madigan Jr, William JFLgranted 2003-06-19cancelled 2008-01-08
Successor callsigns
Callsigns held now by people who previously held N4BJM.
No current licensee on record previously held this callsign.
All historical holders
Every license row we've seen with the callsign N4BJM, oldest first.
- Madigan Jr, William J FL2008-01-08 → cancelled 2020-01-09
- —— → cancelled 1997-10-20