Confidence: Medium · Source: FCC ULS · As of 2026-09-12
KF4DER callsign genealogy
Currently held by CONCORD AMATEUR RADIO SOCIETY
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 KF4DER'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 KF4DER.
- W4AMIactiveCONCORD AMATEUR RADIO SOCIETYGAgranted 2020-01-21