Confidence: Medium · Source: FCC ULS · As of 2026-09-14
KM4ZZ callsign genealogy
Currently held by BENSON, CHARLES R
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 KM4ZZ's current licensee, walking backwards.
- BENSON, CHARLES RVAgranted 2015-07-13cancelled 2015-09-29
Successor callsigns
Callsigns held now by people who previously held KM4ZZ.
- Dufford, Dennis WCOgranted 2017-02-02
All historical holders
Every license row we've seen with the callsign KM4ZZ, oldest first.
- Dufford, Dennis W FL1999-06-17 → cancelled 2007-04-14
- BENSON, CHARLES R VA2025-07-08 active