Confidence: Medium · Source: FCC ULS · As of 2026-09-12
AA9US callsign genealogy
Currently held by PARKS, WILLIAM E
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 AA9US's current licensee, walking backwards.
- KC9AARcancelledMarshfield Area Amateur Radio SocietyWIgranted 2001-07-27cancelled 2001-09-07
Successor callsigns
Callsigns held now by people who previously held AA9US.
No current licensee on record previously held this callsign.
All historical holders
Every license row we've seen with the callsign AA9US, oldest first.
- PARKS, WILLIAM E WI1997-07-09 → cancelled 1998-01-13
- MARSHFIELD AMATEUR RADIO SOCIETY WI2021-07-09 active