Confidence: Medium · Source: FCC ULS · As of 2026-09-12
KZ9DX callsign genealogy
Currently held by KOSSAKOWSKI, ZYGMUNT
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 KZ9DX's current licensee, walking backwards.
- KOSSAKOWSKI, ZYGMUNTILgranted 2004-06-01cancelled 2006-06-10
Successor callsigns
Callsigns held now by people who previously held KZ9DX.
No current licensee on record previously held this callsign.