uls-tracker
Sign in
Confidence: Medium · Source: FCC ULS · As of 2026-09-12

W1DFX callsign genealogy

Currently held by Smith, Robert J

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 W1DFX's current licensee, walking backwards.

  1. KO4VAOcancelled· T
    Smith, Robert JTNgranted 2021-11-29cancelled 2021-12-17

Successor callsigns

Callsigns held now by people who previously held W1DFX.

  1. K4DFXactive· T
    Smith, Robert JTNgranted 2023-04-07
  2. K1RTRcancelled· E
    COOK, RICHARD JCAgranted 2011-10-12cancelled 2018-07-17

All historical holders

Every license row we've seen with the callsign W1DFX, oldest first.

  • COOK, RICHARD J FL
    2006-10-24 → cancelled 2011-10-12
  • Smith, Robert J TN
    2021-12-17 → cancelled 2023-04-07
← Back to W1DFX License history →