Confidence: Medium · Source: FCC ULS · As of 2026-09-12
K4EFG callsign genealogy
Currently held by MASEK, CHARLES 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 K4EFG's current licensee, walking backwards.
- Shafa, Dariush AKYgranted 2009-08-19cancelled 2010-06-11
Successor callsigns
Callsigns held now by people who previously held K4EFG.
No current licensee on record previously held this callsign.
All historical holders
Every license row we've seen with the callsign K4EFG, oldest first.
- MASEK, CHARLES J VA1996-07-29 → cancelled 2008-07-30
- Shafa, Dariush A KY2020-04-21 active