Confidence: Medium · Source: FCC ULS · As of 2026-09-14
K9IWX callsign genealogy
Currently held by TRIEB, DONALD C
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 K9IWX's current licensee, walking backwards.
- Michalak, EricWIgranted 2014-06-17cancelled 2015-09-29
Successor callsigns
Callsigns held now by people who previously held K9IWX.
- TRIEB, DONALD CAZgranted 2009-04-01cancelled 2021-06-11
All historical holders
Every license row we've seen with the callsign K9IWX, oldest first.
- Michalak, Eric WI2025-07-29 active
- TRIEB, DONALD C— → cancelled 1999-06-10