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

K4MJD callsign genealogy

Currently held by DOWNEY, MICHAEL 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 K4MJD's current licensee, walking backwards.

  1. KE4MJDcancelled· G
    DZIUBA, MICHAEL JTNgranted 2020-09-18cancelled 2021-09-11
  2. KB4WTFactive· G
    Cararo, SalvatoreFLgranted 2022-11-04
  3. KQ4DRQcancelled· T
    Cararo, SalvatoreFLgranted 2022-10-12cancelled 2022-11-04

Successor callsigns

Callsigns held now by people who previously held K4MJD.

  1. WB1CDBactive· G
    DZIUBA, MICHAEL JTNgranted 2025-06-27
  2. N2UNactive· E
    DOWNEY, MICHAEL JORgranted 2019-08-20

All historical holders

Every license row we've seen with the callsign K4MJD, oldest first.

  • DOWNEY, MICHAEL J DC
    2011-03-26 → cancelled 2019-08-20
  • DZIUBA, MICHAEL J TN
    2021-09-11 → cancelled 2025-06-27
← Back to K4MJD License history →