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

AA4YD callsign genealogy

Currently held by Thomas, William D

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 AA4YD's current licensee, walking backwards.

  1. W4YDDcancelled· E
    Thomas, William DTNgranted 2020-03-21cancelled 2024-02-23
  2. KC4YDDcancelled· G
    Thomas, William DTNgranted 2018-09-12cancelled 2020-03-21
  3. KN4OQPcancelled· T
    Thomas, William DTNgranted 2018-08-21cancelled 2018-09-12

Successor callsigns

Callsigns held now by people who previously held AA4YD.

  1. W5JJTactive· E
    TRIMARCHI, JOSEPH JNMgranted 2025-11-20
  2. AB4UTactive· E
    Thomas, William DTNgranted 2024-05-18

All historical holders

Every license row we've seen with the callsign AA4YD, oldest first.

  • TRIMARCHI, JOSEPH J NM
    2006-10-05 → cancelled 2016-02-09
  • Thomas, William D TN
    2024-02-23 → cancelled 2024-05-18
← Back to AA4YD License history →