uls-tracker
Sign in
Confidence: Medium · Source: FCC ULS · As of 2026-09-14

N4QOI callsign genealogy

Currently held by DUFFY, PHILIP O

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 N4QOI's current licensee, walking backwards.

  1. KC4AMU
    no FCC ULS record on file

Successor callsigns

Callsigns held now by people who previously held N4QOI.

No current licensee on record previously held this callsign.

← Back to N4QOI License history →