Confidence: Medium · Source: FCC ULS · As of 2026-09-12
K4MU callsign genealogy
Currently held by YORK, LARRY E
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 K4MU's current licensee, walking backwards.
- YORK, LARRY ENCgranted 1999-11-03cancelled 2005-01-25
Successor callsigns
Callsigns held now by people who previously held K4MU.
No current licensee on record previously held this callsign.
All historical holders
Every license row we've seen with the callsign K4MU, oldest first.
- ROSS CLUNIS JR, HAYDEN A VA1995-09-25 → cancelled 2003-01-06
- YORK, LARRY E NC2024-12-20 active