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

W4EFB callsign genealogy

Currently held by KAEFF JR, CHARLES N

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 W4EFB's current licensee, walking backwards.

  1. KY4GVcancelled· E
    KAEFF JR, CHARLES NKYgranted 2020-02-28cancelled 2021-12-03
  2. WA4HCCcancelled· E
    KAEFF JR, CHARLES NKYgranted 2022-04-01cancelled 2023-05-02

Successor callsigns

Callsigns held now by people who previously held W4EFB.

  1. WA4HCCcancelled· E
    KAEFF JR, CHARLES NKYgranted 2022-04-01cancelled 2023-05-02
  2. AC4WLcancelled· E
    KAEFF JR, CHARLES NKYgranted 2016-03-08cancelled 2016-05-25
  3. NK4UScancelled· E
    KAEFF JR, CHARLES NKYgranted 2015-12-04cancelled 2016-02-17
  4. K8YJcancelled· E
    KAEFF JR, CHARLES NKYgranted 2003-02-11cancelled 2004-04-02

All historical holders

Every license row we've seen with the callsign W4EFB, oldest first.

  • KAEFF JR, CHARLES N KY
    1997-02-12 → cancelled 2003-02-11
  • KAEFF JR, CHARLES N KY
    2014-07-04 → cancelled 2015-12-04
  • KAEFF JR, CHARLES N KY
    2016-02-17 → cancelled 2016-03-08
  • KAEFF JR, CHARLES N KY
    2021-12-03 → cancelled 2022-04-01
← Back to W4EFB License history →