Confidence: Medium · Source: FCC ULS · As of 2026-09-14
K0NZ callsign genealogy
Currently held by KOSTELECKY, 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 K0NZ's current licensee, walking backwards.
- KOSTELECKY, DONALD JNDgranted 1998-12-31cancelled 1999-09-30
Successor callsigns
Callsigns held now by people who previously held K0NZ.
No current licensee on record previously held this callsign.