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

AB4T callsign genealogy

Currently held by HALLIHAN, PATRICK T

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 AB4T's current licensee, walking backwards.

  1. AK4UTcancelled· E
    HALLIHAN, PATRICK TNCgranted 2020-05-12cancelled 2021-05-08
  2. NR1Kactive· E
    Hou, SongyaoCAgranted 2022-07-06
  3. KN6TVXcancelled· E
    Hou, SongyaoCAgranted 2022-04-19cancelled 2022-07-06

Successor callsigns

Callsigns held now by people who previously held AB4T.

No current licensee on record previously held this callsign.

All historical holders

Every license row we've seen with the callsign AB4T, oldest first.

  • AVINGER JR, HARRY C NC
    2017-06-13 → cancelled 2019-04-19
  • HALLIHAN, PATRICK T NC
    2021-05-08 active
← Back to AB4T License history →