Confidence: Medium · Source: FCC ULS · As of 2026-09-12
KM4U callsign genealogy
Currently held by HOFFMAN, CARL M
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 KM4U's current licensee, walking backwards.
Successor callsigns
Callsigns held now by people who previously held KM4U.
No current licensee on record previously held this callsign.
All historical holders
Every license row we've seen with the callsign KM4U, oldest first.
- HOFFMAN, CARL M NC1997-09-26 → cancelled 2009-09-29
- ROBINSON, MICHAEL D KY2019-09-18 active