Confidence: Medium · Source: FCC ULS · As of 2026-09-12
KB9CMX callsign genealogy
Currently held by SUDD, DOUGLAS
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 KB9CMX's current licensee, walking backwards.
- SUDD, DOUGLASFLgranted 2015-03-16cancelled 2015-04-03
Successor callsigns
Callsigns held now by people who previously held KB9CMX.
No current licensee on record previously held this callsign.
All historical holders
Every license row we've seen with the callsign KB9CMX, oldest first.
- SUDD, DOUGLAS J IL1989-11-07 → cancelled 2002-03-07
- SUDD, DOUGLAS FL2015-04-03 active