Confidence: Medium · Source: FCC ULS · As of 2026-09-14
K9DUF callsign genealogy
Currently held by Duffy, Jason 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 K9DUF's current licensee, walking backwards.
- Duffy, Jason CILgranted 2017-08-30cancelled 2017-10-06
Successor callsigns
Callsigns held now by people who previously held K9DUF.
- Belt, William JILgranted 2017-01-30
All historical holders
Every license row we've seen with the callsign K9DUF, oldest first.
- Belt, William J IL1997-12-31 → cancelled 2007-04-20
- Duffy, Jason C IL2017-10-06 active