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Confidence: Medium · Source: FCC ULS · As of 2026-09-12

WD4DVO callsign genealogy

Currently held by JOHNSTON III, WILLIAM D

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 WD4DVO's current licensee, walking backwards.

  1. W6GASactive· E
    Sprehn, GregoryCAgranted 2016-04-12
  2. KM6AROcancelled· E
    Sprehn, GregoryCAgranted 2016-02-24cancelled 2016-04-12

Successor callsigns

Callsigns held now by people who previously held WD4DVO.

  1. WD6DVOcancelled· E
    JOHNSTON III, WILLIAM DCAgranted 2020-02-11cancelled 2021-01-19
← Back to WD4DVO License history →