Confidence: Medium · Source: FCC ULS · As of 2026-09-14
KZ4SV callsign genealogy
Currently held by Shirley, Michael 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 KZ4SV's current licensee, walking backwards.
- Shirley, Michael LGAgranted 2025-02-15cancelled 2025-05-08
Successor callsigns
Callsigns held now by people who previously held KZ4SV.
No current licensee on record previously held this callsign.