Confidence: Medium · Source: FCC ULS · As of 2026-09-14
K7JZO callsign genealogy
Currently held by ZWOSTA, JOHN A
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 K7JZO's current licensee, walking backwards.
- ZWOSTA, JOHN AWAgranted 2008-05-07cancelled 2009-01-27
Successor callsigns
Callsigns held now by people who previously held K7JZO.
No current licensee on record previously held this callsign.
All historical holders
Every license row we've seen with the callsign K7JZO, oldest first.
- WARD, HAROLD G MT1994-01-04 → cancelled 2006-01-05
- ZWOSTA, JOHN A WA2018-11-01 active