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

K5OOO callsign genealogy

Currently held by BILLINGTON, William R

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 K5OOO's current licensee, walking backwards.

  1. KR4DITcancelled· T
    Kaplan, JonFLgranted 2025-04-19cancelled 2025-05-09

Successor callsigns

Callsigns held now by people who previously held K5OOO.

  1. K2UHcancelled· E
    Kaplan, JonFLgranted 2025-12-09cancelled 2026-02-27
  2. K5AAAcancelled· G
    BILLINGTON, William RTXgranted 2022-09-24cancelled 2023-10-24

All historical holders

Every license row we've seen with the callsign K5OOO, oldest first.

  • JEANSONNE, GIBBONS J LA
    2006-03-30 → cancelled 2018-06-13
  • BILLINGTON, William R TX
    2019-03-09 → cancelled 2022-09-24
  • Kaplan, Jon FL
    2025-05-09 → cancelled 2025-12-09
← Back to K5OOO License history →