Confidence: Medium · Source: FCC ULS · As of 2026-09-12
AC0SD callsign genealogy
Currently held by Keefe, Wayne
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 AC0SD's current licensee, walking backwards.
Successor callsigns
Callsigns held now by people who previously held AC0SD.
- Keefe, WayneSDgranted 2024-04-02cancelled 2024-05-24
All historical holders
Every license row we've seen with the callsign AC0SD, oldest first.
- Clore, Carl M IA2010-05-13 → cancelled 2022-05-14
- Keefe, Wayne SD2024-02-06 → cancelled 2024-04-02