Confidence: Medium · Source: FCC ULS · As of 2026-09-14
WW9USA callsign genealogy
Currently held by HACKL, JOSEPH K
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 WW9USA's current licensee, walking backwards.
- HACKL, JOSEPH KWIgranted 2018-12-31cancelled 2019-02-14
Successor callsigns
Callsigns held now by people who previously held WW9USA.
No current licensee on record previously held this callsign.
All historical holders
Every license row we've seen with the callsign WW9USA, oldest first.
- RUZICKA, VLADIMIR IL2006-09-19 → cancelled 2018-09-20
- HACKL, JOSEPH K WI2019-02-14 active