Confidence: Medium · Source: FCC ULS · As of 2026-09-12
KS4OA callsign genealogy
Currently held by KEYS III, WILLIAM W
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 KS4OA'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 KS4OA.
- KEYS III, WILLIAM WFLgranted 2000-08-15cancelled 2000-12-30