Confidence: Medium · Source: FCC ULS · As of 2026-09-14
K4DUF callsign genealogy
Currently held by Duffy, Ian 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 K4DUF's current licensee, walking backwards.
- Duffy, Ian PVAgranted 2024-01-25cancelled 2024-04-05
Successor callsigns
Callsigns held now by people who previously held K4DUF.
No current licensee on record previously held this callsign.