Confidence: Medium · Source: FCC ULS · As of 2026-09-12
W4DEM callsign genealogy
Currently held by DE MATTEO, WILLIAM M
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 W4DEM's current licensee, walking backwards.
- KO4NUcancelledcancelled 1997-10-01
Successor callsigns
Callsigns held now by people who previously held W4DEM.
No current licensee on record previously held this callsign.