Confidence: Medium · Source: FCC ULS · As of 2026-09-12
KT9U callsign genealogy
Currently held by Sieh, Dai D
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 KT9U's current licensee, walking backwards.
- KE9CJIcancelledMidwest HammersILgranted 2025-01-24cancelled 2025-02-15
Successor callsigns
Callsigns held now by people who previously held KT9U.
- Sieh, Dai DCAgranted 2022-12-09
All historical holders
Every license row we've seen with the callsign KT9U, oldest first.
- Sieh, Dai D CA2012-11-22 → cancelled 2022-12-09
- Midwest Hammers IL2025-02-15 active