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

KX4AOC callsign genealogy

Currently held by Emerson, Keith 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 KX4AOC's current licensee, walking backwards.

  1. KD9CPHactive· T
    Emerson, Keith DILgranted 2020-12-04

Successor callsigns

Callsigns held now by people who previously held KX4AOC.

  1. KD9CPHactive· T
    Emerson, Keith DILgranted 2020-12-04
  2. KD9CPHcancelled· T
    Emerson, Keith DFLgranted 2019-11-19cancelled 2020-10-20
  3. KD9CPHcancelled· T
    Emerson, Keith DFLgranted 2019-02-22cancelled 2019-10-27
  4. KD9CPHcancelled· T
    Emerson, Keith DINgranted 2016-12-23cancelled 2017-09-15

All historical holders

Every license row we've seen with the callsign KX4AOC, oldest first.

  • Emerson, Keith IN
    2016-10-21 → cancelled 2016-12-23
  • Emerson, Keith D FL
    2018-11-14 → cancelled 2019-02-22
  • Emerson, Keith D FL
    2019-10-27 → cancelled 2019-11-19
  • Emerson, Keith D FL
    2020-10-20 → cancelled 2020-12-04
← Back to KX4AOC License history →