Confidence: Medium · Source: FCC ULS · As of 2026-10-28
W4OSO 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 W4OSO's current licensee, walking backwards.
- Aubut, Michael PFLgranted 2026-08-12cancelled 2026-09-15
Successor callsigns
Callsigns held now by people who previously held W4OSO.
- WITTE, PAUL MSCgranted 2018-01-26
All historical holders
Every license row we've seen with the callsign W4OSO, oldest first.
- Aubut, Michael P FL2026-09-15 active
- —— → cancelled 1998-04-23