Confidence: Medium · Source: FCC ULS · As of 2026-09-14
NM4Y callsign genealogy
Currently held by KOEBEL SR, MICHAEL W
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 NM4Y's current licensee, walking backwards.
- Dexter Jr, DanielFLgranted 2024-04-23cancelled 2024-05-31
Successor callsigns
Callsigns held now by people who previously held NM4Y.
No current licensee on record previously held this callsign.
All historical holders
Every license row we've seen with the callsign NM4Y, oldest first.
- KOEBEL SR, MICHAEL W KY2012-04-18 → cancelled 2024-05-14
- Dexter Jr, Daniel FL2024-05-31 active