Confidence: Medium · Source: FCC ULS · As of 2026-09-12
AC9SO callsign genealogy
Currently held by Siegler, David 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 AC9SO's current licensee, walking backwards.
- Siegler, David WWIgranted 2018-01-08cancelled 2018-04-02
Successor callsigns
Callsigns held now by people who previously held AC9SO.
- Siegler, David WWIgranted 2018-06-12