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

AB9OO callsign genealogy

Currently held by O'Donnell, Michael J

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 AB9OO's current licensee, walking backwards.

  1. W9KBJcancelled· E
    Dehner, Robert EINgranted 2020-10-02cancelled 2025-04-29
  2. N9NTPcancelled· T
    DEHNER, ROBERT EINgranted 1992-01-07cancelled 2000-11-21

Successor callsigns

Callsigns held now by people who previously held AB9OO.

No current licensee on record previously held this callsign.

All historical holders

Every license row we've seen with the callsign AB9OO, oldest first.

  • O'Donnell, Michael J WI
    2012-03-09 → cancelled 2024-06-04
  • Dehner, Robert E IN
    2025-04-29 active
← Back to AB9OO License history →