Confidence: Medium · Source: FCC ULS · As of 2026-09-12
AA4AT callsign genealogy
Currently held by Thiemens, Arthur 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 AA4AT's current licensee, walking backwards.
- GREATHEAD, SHAUN TNCgranted 2021-03-15cancelled 2022-10-14
Successor callsigns
Callsigns held now by people who previously held AA4AT.
No current licensee on record previously held this callsign.
All historical holders
Every license row we've seen with the callsign AA4AT, oldest first.
- Thiemens, Arthur A VA2004-04-19 → cancelled 2010-01-10
- Art Thiemens Memorial Club VA2010-05-15 → cancelled 2022-05-17
- GREATHEAD, SHAUN T NC2022-10-14 active