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

KB4JAC callsign genealogy

Currently held by COOK, JACOB 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 KB4JAC's current licensee, walking backwards.

  1. N4ADZactive· T
    ZIGLAR, DAVID MNCgranted 2024-05-10
  2. KQ4REHcancelled· T
    ZIGLAR, DAVID MNCgranted 2024-04-16cancelled 2024-05-10

Successor callsigns

Callsigns held now by people who previously held KB4JAC.

  1. K4ATAexpired· T
    COOK, JACOB AGAgranted 2004-08-03cancelled 2016-08-04

All historical holders

Every license row we've seen with the callsign KB4JAC, oldest first.

  • COOK, JACOB A GA
    2003-08-12 → cancelled 2004-08-03
  • CHOJNACKI, JOEL A TN
    2019-07-30 active
← Back to KB4JAC License history →