Confidence: Medium · Source: FCC ULS · As of 2026-09-14
KY4MJO callsign genealogy
Currently held by OLAFSON, MICHAEL 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 KY4MJO's current licensee, walking backwards.
- OLAFSON, MICHAEL JKYgranted 2024-07-30cancelled 2024-08-23
Successor callsigns
Callsigns held now by people who previously held KY4MJO.
No current licensee on record previously held this callsign.