Confidence: Medium · Source: FCC ULS · As of 2026-09-14
N4DUF callsign genealogy
Currently held by McDuff, William 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 N4DUF's current licensee, walking backwards.
- McDuff, William MMDgranted 2020-08-13cancelled 2021-05-04
Successor callsigns
Callsigns held now by people who previously held N4DUF.
No current licensee on record previously held this callsign.
All historical holders
Every license row we've seen with the callsign N4DUF, oldest first.
- MULLINS, VICTOR KY2006-11-21 → cancelled 2019-02-12
- McDuff, William M MD2021-05-04 active