Confidence: Medium · Source: FCC ULS · As of 2026-09-12
K4ZIS callsign genealogy
Currently held by Boise, John 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 K4ZIS's current licensee, walking backwards.
- Boise, John MKYgranted 2019-10-23cancelled 2020-07-24
Successor callsigns
Callsigns held now by people who previously held K4ZIS.
No current licensee on record previously held this callsign.