Confidence: Medium · Source: FCC ULS · As of 2026-09-12
KZ4IP callsign genealogy
Currently held by Ter Haar, Robbert H
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 KZ4IP's current licensee, walking backwards.
- Ter Haar, Robbert HTNgranted 2024-03-19cancelled 2024-06-12
Successor callsigns
Callsigns held now by people who previously held KZ4IP.
No current licensee on record previously held this callsign.