Confidence: Medium · Source: FCC ULS · As of 2026-09-12
AC9OS callsign genealogy
Currently held by Smith, Brian P
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 AC9OS's current licensee, walking backwards.
- Smith, Brian PWIgranted 2011-04-12cancelled 2016-06-15
Successor callsigns
Callsigns held now by people who previously held AC9OS.
- Smith, Brian PMSgranted 2026-08-13