Confidence: Medium · Source: FCC ULS · As of 2026-09-12
KA0RIZ callsign genealogy
Currently held by Macbride, John R
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 KA0RIZ's current licensee, walking backwards.
- Macbride, John RORgranted 2021-02-09cancelled 2021-03-02
Successor callsigns
Callsigns held now by people who previously held KA0RIZ.
No current licensee on record previously held this callsign.
All historical holders
Every license row we've seen with the callsign KA0RIZ, oldest first.
- TRUESDALE, PHILIP J MO1988-10-25 → cancelled 2000-10-26
- Macbride, John R OR2021-03-02 active