Confidence: Medium · Source: FCC ULS · As of 2026-09-14
KD4WIZ callsign genealogy
Currently held by Willis Sr, Jonathan M
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 KD4WIZ's current licensee, walking backwards.
- Willis Sr, Jonathan MNCgranted 2012-11-28cancelled 2012-12-28
Successor callsigns
Callsigns held now by people who previously held KD4WIZ.
No current licensee on record previously held this callsign.
All historical holders
Every license row we've seen with the callsign KD4WIZ, oldest first.
- WILLIS SR, JONATHAN M NC1993-01-26 → cancelled 2005-01-27
- Willis Sr, Jonathan M NC2022-12-01 active