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

KJ4DA callsign genealogy

Currently held by Thatcher III, John C

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 KJ4DA's current licensee, walking backwards.

  1. K4JCTactive· T
    Trice, John CAZgranted 2024-12-14
  2. KG7FKZcancelled· T
    Trice, John CAZgranted 2013-09-17cancelled 2013-10-17

Successor callsigns

Callsigns held now by people who previously held KJ4DA.

  1. W4DIJactive· E
    Thatcher iii, John CTNgranted 2014-09-30
  2. K4JCTcancelled· A
    THATCHER, JOHN CTNgranted 1999-04-08cancelled 2000-05-02

All historical holders

Every license row we've seen with the callsign KJ4DA, oldest first.

  • Thatcher III, John C TN
    2010-03-05 → cancelled 2014-09-30
  • THATCHER, JOHN C
    — → cancelled 1999-04-08
← Back to KJ4DA License history →