Confidence: Medium · Source: FCC ULS · As of 2026-09-12
N4MDB callsign genealogy
Currently held by Brooks, Mike D
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 N4MDB's current licensee, walking backwards.
- Brooks, Mike DGAgranted 2002-12-06cancelled 2009-01-03
Successor callsigns
Callsigns held now by people who previously held N4MDB.
No current licensee on record previously held this callsign.
All historical holders
Every license row we've seen with the callsign N4MDB, oldest first.
- FELLNER, WILLIAM FL1995-08-16 → cancelled 2007-08-17
- Brooks, Mike D GA2018-10-09 active