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Confidence: Medium · Source: FCC ULS · As of 2026-09-14

K5KOA callsign genealogy

Currently held by FOSS, CAROL V

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 K5KOA's current licensee, walking backwards.

  1. W1KOAactive· T
    Thomason, Richard LTNgranted 2022-04-29
  2. KO4ZEEcancelled· T
    THOMASON, RICHARD RTNgranted 2022-04-01cancelled 2022-04-29

Successor callsigns

Callsigns held now by people who previously held K5KOA.

  1. K5OOOcancelled· G
    BILLINGTON, William RTXgranted 2019-03-09cancelled 2022-09-24

All historical holders

Every license row we've seen with the callsign K5KOA, oldest first.

  • FOSS, CAROL V TX
    2005-05-06 → cancelled 2017-07-22
  • BILLINGTON, WILLIAM R TX
    2017-10-28 → cancelled 2019-03-09
← Back to K5KOA License history →