Confidence: Medium · Source: FCC ULS · As of 2026-09-14
K1ZA callsign genealogy
Currently held by GUIDA, JOHN
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 K1ZA's current licensee, walking backwards.
- van der Riet, Kim PMAgranted 2008-12-02cancelled 2008-12-23
Successor callsigns
Callsigns held now by people who previously held K1ZA.
- GUIDA, JOHNTXgranted 2016-08-31
All historical holders
Every license row we've seen with the callsign K1ZA, oldest first.
- PERSINSKI, EDWARD CA1988-03-22 → cancelled 1991-08-23
- GUIDA, JOHN TX2000-02-11 → cancelled 2006-11-17
- van der Riet, Kim P GA2018-10-10 active