Confidence: Medium · Source: FCC ULS · As of 2026-09-12
K7ZR callsign genealogy
Currently held by MATTSON, JOEL
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 K7ZR's current licensee, walking backwards.
- MATTSON, JOELWAgranted 2016-10-03cancelled 2017-05-09
Successor callsigns
Callsigns held now by people who previously held K7ZR.
No current licensee on record previously held this callsign.
All historical holders
Every license row we've seen with the callsign K7ZR, oldest first.
- BOCK, JACK D WA1998-04-27 → cancelled 2003-03-29
- Salton Sea Amateur Radio Club CA2005-04-19 → cancelled 2017-04-20
- MATTSON, JOEL WA2017-05-09 active