Confidence: Medium · Source: FCC ULS · As of 2026-09-14
KF4USA callsign genealogy
Currently held by Moon, 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 KF4USA's current licensee, walking backwards.
- Moon, Matthew JALgranted 2022-03-17cancelled 2022-04-15
Successor callsigns
Callsigns held now by people who previously held KF4USA.
No current licensee on record previously held this callsign.
All historical holders
Every license row we've seen with the callsign KF4USA, oldest first.
- CLAIRMONT, DUANE W SC2007-08-23 → cancelled 2019-11-19
- Moon, Matthew J AL2022-04-15 active