Confidence: Medium · Source: FCC ULS · As of 2026-09-14
KC6SFI callsign genealogy
Currently held by BOIKO, WILLIAM M
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 KC6SFI'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 KC6SFI.
- BOIKO, WILLIAM MCAgranted 2024-07-20