Confidence: Medium · Source: FCC ULS · As of 2026-09-14
KO4SBL callsign genealogy
Currently held by Larson, Stephen B
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 KO4SBL's current licensee, walking backwards.
- Larson, Stephen BNCgranted 2020-07-20cancelled 2020-08-08
Successor callsigns
Callsigns held now by people who previously held KO4SBL.
No current licensee on record previously held this callsign.