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

KD4UJC callsign genealogy

Currently held by CALLAM, MICHAEL E

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 KD4UJC's current licensee, walking backwards.

  1. W4JRZactive· G
    Zimmerman, Justin RTNgranted 2025-08-23
  2. KM4MPJcancelled· G
    Zimmerman, Justin RTNgranted 2015-08-14cancelled 2015-09-15

Successor callsigns

Callsigns held now by people who previously held KD4UJC.

  1. KD4MCactive· E
    CALLAM, MICHAEL ENCgranted 2024-11-13
  2. W4JRZcancelled· G
    CALLAM, MICHAEL ENCgranted 2003-01-10cancelled 2008-08-15

All historical holders

Every license row we've seen with the callsign KD4UJC, oldest first.

  • CALLAM, MICHAEL E NC
    1994-03-29 → cancelled 2003-01-10
  • CALLAM, MICHAEL E NC
    2008-08-15 → cancelled 2014-12-02
← Back to KD4UJC License history →