Confidence: Medium · Source: FCC ULS · As of 2026-09-14
KC4EFI callsign genealogy
Currently held by DUNCAN JR, THOMAS A
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 KC4EFI's current licensee, walking backwards.
The current licensee has not held any other callsign on record.
Successor callsigns
Callsigns held now by people who previously held KC4EFI.
- DUNCAN JR, THOMAS AVAgranted 2025-11-21