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

W4UDX callsign genealogy

Currently held by ABEL, MARK 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 W4UDX's current licensee, walking backwards.

  1. W3NPAcancelled· G
    ABEL, MARK JKYgranted 2023-05-05cancelled 2024-02-16

Successor callsigns

Callsigns held now by people who previously held W4UDX.

  1. W3NPAcancelled· G
    ABEL, MARK JKYgranted 2023-05-05cancelled 2024-02-16
  2. KB4AEPcancelled· G
    ABEL, MARK JKYgranted 2018-07-31cancelled 2019-03-16
  3. W7ARFcancelled· G
    ABEL, MARK JKYgranted 2008-09-30cancelled 2009-02-18

All historical holders

Every license row we've seen with the callsign W4UDX, oldest first.

  • ABEL, MARK J KY
    1998-12-30 → cancelled 2008-09-30
  • ABEL, MARK J KY
    2009-02-18 → cancelled 2018-07-31
  • ABEL, MARK J KY
    2019-03-16 → cancelled 2023-05-05
  • ABEL, MARK J KY
    2024-02-16 active
← Back to W4UDX License history →