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Confidence: Medium · Source: FCC ULS · As of 2026-09-14

KO4I callsign genealogy

Currently held by FIESELMAN II, WILLIAM H

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 KO4I's current licensee, walking backwards.

  1. KC9TZXcancelled· E
    Skala, Tyler MKYgranted 2019-02-20cancelled 2025-07-11
  2. KC9PORcancelled· G
    James, Tyler MINgranted 2009-04-17cancelled 2011-04-07

Successor callsigns

Callsigns held now by people who previously held KO4I.

  1. NE9Mactive
    5 Beers DX And Contest ClubTNgranted 2023-06-22

All historical holders

Every license row we've seen with the callsign KO4I, oldest first.

  • FIESELMAN II, WILLIAM H AL
    2010-04-27 → cancelled 2022-07-26
  • 5 Beers DX And Contest Club TN
    2022-08-12 → cancelled 2023-06-22
  • Skala, Tyler M KY
    2025-07-11 active
← Back to KO4I License history →