Confidence: Medium · Source: FCC ULS · As of 2026-09-12
KZ9M callsign genealogy
Currently held by SOBEY, DONALD 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 KZ9M's current licensee, walking backwards.
- Kostanski, Alexander NOHgranted 2022-05-04cancelled 2025-09-26
Successor callsigns
Callsigns held now by people who previously held KZ9M.
No current licensee on record previously held this callsign.
All historical holders
Every license row we've seen with the callsign KZ9M, oldest first.
- SOBEY, DONALD J AZ2013-06-18 → cancelled 2025-09-04
- Kostanski, Alexander N OH2025-09-26 active