Confidence: Medium · Source: FCC ULS · As of 2026-09-12
W9SJO callsign genealogy
Currently held by Osthus, Steven J
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 W9SJO's current licensee, walking backwards.
- Osthus, Steven JWIgranted 2021-12-10cancelled 2022-02-01
Successor callsigns
Callsigns held now by people who previously held W9SJO.
No current licensee on record previously held this callsign.