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

AD4O callsign genealogy

Currently held by WALTON, JERRY F

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 AD4O's current licensee, walking backwards.

  1. N5BDJactive· T
    Joly R Davila, Fred JTXgranted 2024-10-11
  2. KJ5IBLcancelled· T
    RIBAS DAVILA, FREDERICO JTXgranted 2024-09-21cancelled 2024-10-11

Successor callsigns

Callsigns held now by people who previously held AD4O.

No current licensee on record previously held this callsign.

All historical holders

Every license row we've seen with the callsign AD4O, oldest first.

  • WALTON, JERRY F AL
    1987-12-22 → cancelled 1999-12-23
  • DOWNS, J ROBERT AL
    2010-02-12 → cancelled 2022-04-19
  • BARRETT, GREGORY A AL
    2022-05-07 active
← Back to AD4O License history →