Confidence: Medium · Source: FCC ULS · As of 2026-09-14
KR4SF callsign genealogy
Currently held by WARNER II, CHARLES L
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 KR4SF's current licensee, walking backwards.
- KE5OVno FCC ULS record on file
Successor callsigns
Callsigns held now by people who previously held KR4SF.
No current licensee on record previously held this callsign.