Confidence: Medium · Source: FCC ULS · As of 2026-09-12
AC0AI callsign genealogy
Currently held by Klimczak, Joseph C
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 AC0AI's current licensee, walking backwards.
- Klimczak, Joseph CMOgranted 2004-02-18cancelled 2004-03-01
Successor callsigns
Callsigns held now by people who previously held AC0AI.
- Klimczak, Joseph CMOgranted 2023-12-28