Confidence: Medium · Source: FCC ULS · As of 2026-09-12
N4CDX callsign genealogy
Currently held by Heijmans, 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 N4CDX's current licensee, walking backwards.
- Heijmans, Michael LFLgranted 2003-11-20cancelled 2004-09-08
Successor callsigns
Callsigns held now by people who previously held N4CDX.
No current licensee on record previously held this callsign.