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

NK4US 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 NK4US's current licensee, walking backwards.

  1. W4EFBcancelled· E
    KAEFF JR, CHARLES NKYgranted 2021-12-03cancelled 2022-04-01
  2. KY4GVcancelled· E
    KAEFF JR, CHARLES NKYgranted 2020-02-28cancelled 2021-12-03
  3. WA4HCCcancelled· E
    KAEFF JR, CHARLES NKYgranted 2022-04-01cancelled 2023-05-02

Successor callsigns

Callsigns held now by people who previously held NK4US.

  1. W4EFBcancelled· E
    KAEFF JR, CHARLES NKYgranted 2016-02-17cancelled 2016-03-08
← Back to NK4US License history →