Confidence: Medium · Source: FCC ULS · As of 2026-09-12
AC4EU callsign genealogy
Currently held by BUCHSTEINER, GERD S
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 AC4EU's current licensee, walking backwards.
- Buchsteiner, Gerd SFLgranted 2022-11-15cancelled 2022-12-28
Successor callsigns
Callsigns held now by people who previously held AC4EU.
No current licensee on record previously held this callsign.
All historical holders
Every license row we've seen with the callsign AC4EU, oldest first.
- BUCHSTEINER, GERD S MD2001-01-29 → cancelled 2013-04-10
- Buchsteiner, Gerd S FL2022-12-28 active