Confidence: Medium · Source: FCC ULS · As of 2026-09-12
KC3MZ callsign genealogy
Currently held by Zwingl, Michael
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 KC3MZ's current licensee, walking backwards.
- Zwingl, MichaelFLgranted 2016-08-10cancelled 2025-02-08
Successor callsigns
Callsigns held now by people who previously held KC3MZ.
No current licensee on record previously held this callsign.
All historical holders
Every license row we've seen with the callsign KC3MZ, oldest first.
- TRUE JR, ROBERT A PA2003-12-29 → cancelled 2016-01-05
- Zwingl, Michael FL2025-02-08 active