Confidence: Medium · Source: FCC ULS · As of 2026-09-12
N9DUX callsign genealogy
Currently held by Kummerow, James P
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 N9DUX's current licensee, walking backwards.
- Kummerow, James PCOgranted 2009-06-25cancelled 2010-02-27
Successor callsigns
Callsigns held now by people who previously held N9DUX.
- Kummerow, James PCOgranted 2023-06-28
All historical holders
Every license row we've seen with the callsign N9DUX, oldest first.
- WHITSELL JR, JIM C IL1998-01-06 → cancelled 2010-01-07
- Kummerow, James P CO2010-02-27 → cancelled 2013-04-09