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

KO5D callsign genealogy

Currently held by Martin, Jeffrey N

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 KO5D's current licensee, walking backwards.

  1. AI5IXcancelled· E
    Martin, Jeffrey NTXgranted 2018-04-24cancelled 2022-12-17
  2. K5JNMcancelled· E
    Martin, Jeffrey NTXgranted 2018-04-24cancelled 2022-11-02
  3. KG5WGXcancelled· G
    Martin, Jeffrey NTXgranted 2017-11-30cancelled 2018-04-24

Successor callsigns

Callsigns held now by people who previously held KO5D.

  1. W5JMWactive· E
    WEBB, JOHN MTXgranted 2019-11-21
  2. KN7Kactive· E
    ABRIKOSOV, SERGEYORgranted 2018-07-06

All historical holders

Every license row we've seen with the callsign KO5D, oldest first.

  • WEBB, JOHN M TX
    1999-04-19 → cancelled 2000-01-21
  • ABRIKOSOV, SERGEY OR
    2002-04-02 → cancelled 2008-10-03
  • Durant Amateur Repeater Association OK
    2010-11-28 → cancelled 2022-11-29
  • Martin, Jeffrey N TX
    2022-12-17 active
← Back to KO5D License history →