Confidence: Medium · Source: FCC ULS · As of 2026-09-12
NZ4X callsign genealogy
Currently held by KOIVU, HENRY I
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 NZ4X's current licensee, walking backwards.
- DE ANGELIS, RONALD GFLgranted 2014-10-01cancelled 2019-04-26
Successor callsigns
Callsigns held now by people who previously held NZ4X.
No current licensee on record previously held this callsign.
All historical holders
Every license row we've seen with the callsign NZ4X, oldest first.
- KOIVU, HENRY I FL2007-04-05 → cancelled 2019-04-06
- DE ANGELIS, RONALD G FL2019-04-26 active