Confidence: Medium · Source: FCC ULS · As of 2026-09-14
N1DU callsign genealogy
Currently held by DUMONT, MARK N
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 N1DU's current licensee, walking backwards.
- DUMONT, MARK NMAgranted 1999-06-30cancelled 2000-07-26
Successor callsigns
Callsigns held now by people who previously held N1DU.
No current licensee on record previously held this callsign.