Confidence: Medium · Source: FCC ULS · As of 2026-09-12
KZ4YR callsign genealogy
Currently held by Rothlisberger, Matthew J
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 KZ4YR's current licensee, walking backwards.
- Rothlisberger, Matthew JFLgranted 2025-11-21cancelled 2025-12-22
Successor callsigns
Callsigns held now by people who previously held KZ4YR.
No current licensee on record previously held this callsign.