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

AA0AO callsign genealogy

Currently held by GIEROK, THOMAS A

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 AA0AO's current licensee, walking backwards.

  1. AB0TGcancelled· E
    GIEROK, THOMAS AMNgranted 2014-05-16cancelled 2017-04-21
  2. KD0YMEcancelled· E
    GIEROK, THOMAS AMNgranted 2013-12-12cancelled 2014-05-16

Successor callsigns

Callsigns held now by people who previously held AA0AO.

  1. K7PTLactive· E
    RAFFERTY, MICHAEL GMTgranted 2022-01-05

All historical holders

Every license row we've seen with the callsign AA0AO, oldest first.

  • RAFFERTY, MICHAEL G PA
    2000-01-20 → cancelled 2002-03-26
  • GIEROK, THOMAS A MN
    2017-04-21 active
← Back to AA0AO License history →