Confidence: Medium · Source: FCC ULS · As of 2026-09-14
K5CZH callsign genealogy
Currently held by Kozak, John B
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 K5CZH's current licensee, walking backwards.
- KOZAK, JOHN BTXgranted 2021-05-21cancelled 2021-06-11
Successor callsigns
Callsigns held now by people who previously held K5CZH.
No current licensee on record previously held this callsign.