Confidence: Medium · Source: FCC ULS · As of 2026-09-14
KO4EIF callsign genealogy
Currently held by Winkler, Kevin S
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 KO4EIF'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 KO4EIF.
- Winkler, Kevin SKYgranted 2020-07-07