Confidence: Medium · Source: FCC ULS · As of 2026-09-12
KM4AT callsign genealogy
Currently held by KOPECKY, MATTHEW
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 KM4AT's current licensee, walking backwards.
Successor callsigns
Callsigns held now by people who previously held KM4AT.
- KOPECKY, MATTHEWKYgranted 2024-07-30cancelled 2026-02-27
All historical holders
Every license row we've seen with the callsign KM4AT, oldest first.
- DEYORIO, PAT C FL2002-03-23 → cancelled 2014-06-10
- KOPECKY, MATTHEW KY2024-07-30 → cancelled 2024-12-24