Confidence: Medium · Source: FCC ULS · As of 2026-09-12
KY4M callsign genealogy
Currently held by Muckler, Matthew 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 KY4M's current licensee, walking backwards.
- MUCKLER, MATTHEW JKYgranted 1992-07-21cancelled 2000-02-15
Successor callsigns
Callsigns held now by people who previously held KY4M.
No current licensee on record previously held this callsign.
All historical holders
Every license row we've seen with the callsign KY4M, oldest first.
- SMALLEY, WILLIAM R FL1987-08-11 → cancelled 1999-08-16
- Muckler, Matthew J KY2019-12-03 active