Confidence: Medium · Source: FCC ULS · As of 2026-09-12
K4MIA callsign genealogy
Currently held by JASZCZAK, WILLIAM
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 K4MIA's current licensee, walking backwards.
- BALD, MICHAEL NFLgranted 1997-12-11cancelled 2006-05-13
Successor callsigns
Callsigns held now by people who previously held K4MIA.
No current licensee on record previously held this callsign.
All historical holders
Every license row we've seen with the callsign K4MIA, oldest first.
- JASZCZAK, WILLIAM FL1994-03-22 → cancelled 2006-03-23
- BALD, MICHAEL N FL2026-05-05 active