Confidence: Medium · Source: FCC ULS · As of 2026-09-14
K9WIZ callsign genealogy
Currently held by Wisniewski, Terry L
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 K9WIZ's current licensee, walking backwards.
- Mattsen, Leonard JAZgranted 2016-06-17cancelled 2016-08-13
Successor callsigns
Callsigns held now by people who previously held K9WIZ.
No current licensee on record previously held this callsign.
All historical holders
Every license row we've seen with the callsign K9WIZ, oldest first.
- Wisniewski, Terry L IL2004-03-31 → cancelled 2016-04-01
- Mattsen, Leonard J AZ2016-08-13 active