Confidence: Medium · Source: FCC ULS · As of 2026-09-12
N4DEM callsign genealogy
Currently held by HUMPHREY JR, WILLIAM 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 N4DEM's current licensee, walking backwards.
- KR4BZLcancelledMiami Dade County EOC RACESFLgranted 2025-03-06cancelled 2025-03-25
Successor callsigns
Callsigns held now by people who previously held N4DEM.
No current licensee on record previously held this callsign.
All historical holders
Every license row we've seen with the callsign N4DEM, oldest first.
- HUMPHREY JR, WILLIAM B NC2011-11-08 → cancelled 2024-02-06
- Miami Dade County EOC RACES FL2025-03-25 active