Confidence: Medium · Source: FCC ULS · As of 2026-09-12
N4BDZ callsign genealogy
Currently held by Helms, Michael L
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 N4BDZ's current licensee, walking backwards.
- Helms, Michael LNCgranted 2021-06-17cancelled 2024-07-16
Successor callsigns
Callsigns held now by people who previously held N4BDZ.
No current licensee on record previously held this callsign.
All historical holders
Every license row we've seen with the callsign N4BDZ, oldest first.
- ROSNER, MARK FL2008-01-08 → cancelled 2020-03-27
- Helms, Michael L NC2024-07-16 active