Confidence: Medium · Source: FCC ULS · As of 2026-09-12
K9DUI callsign genealogy
Currently held by Zittlow, David M
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 K9DUI's current licensee, walking backwards.
- Zittlow, David MWIgranted 2013-11-08cancelled 2013-11-30
Successor callsigns
Callsigns held now by people who previously held K9DUI.
No current licensee on record previously held this callsign.
All historical holders
Every license row we've seen with the callsign K9DUI, oldest first.
- CLEGHORN, RAYMOND M WI1988-03-22 → cancelled 2000-03-23
- Zittlow, David M WI2023-11-02 active