Confidence: Medium · Source: FCC ULS · As of 2026-09-14
KS4OI callsign genealogy
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 KS4OI'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 KS4OI.
- SOPRANO, MARTIN BALgranted 2006-09-20cancelled 2007-07-31