Confidence: Medium · Source: FCC ULS · As of 2026-09-12
N4ZHZ callsign genealogy
Currently held by Cox, Robert J
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 N4ZHZ's current licensee, walking backwards.
Successor callsigns
Callsigns held now by people who previously held N4ZHZ.
- COX, ROBERT JVAgranted 2000-06-27cancelled 2003-02-25
All historical holders
Every license row we've seen with the callsign N4ZHZ, oldest first.
- COX, ROBERT J VA1993-01-05 → cancelled 2000-06-27
- Cox, Robert J VA2012-12-08 → cancelled 2025-02-26