Confidence: Medium · Source: FCC ULS · As of 2026-09-12
K0LCZ callsign genealogy
Currently held by Kolacz, Mike
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 K0LCZ's current licensee, walking backwards.
- Kolacz, MikeCOgranted 2013-10-30cancelled 2013-12-13
Successor callsigns
Callsigns held now by people who previously held K0LCZ.
No current licensee on record previously held this callsign.
All historical holders
Every license row we've seen with the callsign K0LCZ, oldest first.
- SHEATS, HAZEL A FL1997-11-04 → cancelled 2004-03-25
- Kolacz, Mike CO2013-12-13 → cancelled 2026-03-07