Confidence: Medium · Source: FCC ULS · As of 2026-09-12
AC0TS callsign genealogy
Currently held by BROWN, DONALD W
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 AC0TS's current licensee, walking backwards.
- Szivos Jr, TiborWAgranted 2020-11-13cancelled 2025-12-23
Successor callsigns
Callsigns held now by people who previously held AC0TS.
- BROWN, DONALD WIAgranted 2024-01-09
All historical holders
Every license row we've seen with the callsign AC0TS, oldest first.
- BROWN, DONALD W IA2010-07-30 → cancelled 2014-03-28
- Szivos Jr, Tibor WA2025-12-23 active