Confidence: Medium · Source: FCC ULS · As of 2026-09-14
WT4AO callsign genealogy
Currently held by OSTBY II, THOMAS A
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 WT4AO's current licensee, walking backwards.
- OSTBY II, THOMAS AGAgranted 2019-11-30
Successor callsigns
Callsigns held now by people who previously held WT4AO.
- OSTBY II, THOMAS AGAgranted 2019-11-30