Confidence: Medium · Source: FCC ULS · As of 2026-09-14
K9IZU callsign genealogy
Currently held by Osterman Umbrella Radio Group
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 K9IZU's current licensee, walking backwards.
- KD9UQOcancelledOsterman Umbrella Radio GroupILgranted 2022-03-24cancelled 2022-04-12
Successor callsigns
Callsigns held now by people who previously held K9IZU.
No current licensee on record previously held this callsign.
All historical holders
Every license row we've seen with the callsign K9IZU, oldest first.
- MESSINA, JOSEPH R AZ2007-12-28 → cancelled 2020-01-24
- Osterman Umbrella Radio Group IL2022-04-12 active