Confidence: Medium · Source: FCC ULS · As of 2026-09-14
KZ4FR callsign genealogy
Currently held by Hammett, Mark A
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 KZ4FR's current licensee, walking backwards.
- Hammett, Mark AALgranted 2024-02-06cancelled 2024-04-02
Successor callsigns
Callsigns held now by people who previously held KZ4FR.
- Hammett, Mark AALgranted 2025-02-08