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

K0TTT callsign genealogy

Currently held by Kumakura, Hiroshi

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 K0TTT's current licensee, walking backwards.

  1. KD0YKFcancelled· G
    KLEIN, STEVEN RCOgranted 2013-12-03cancelled 2014-09-05

Successor callsigns

Callsigns held now by people who previously held K0TTT.

  1. W9WWWactive· G
    Kumakura, HiroshiILgranted 2021-11-27
  2. W0AAAactive· E
    FREEMAN, ANDREW LMNgranted 2017-11-15
  3. WF7Mcancelled
    TTT RADIO CLUBCOgranted 2004-02-10cancelled 2004-06-08

All historical holders

Every license row we've seen with the callsign K0TTT, oldest first.

  • TTT RADIO CLUB CO
    1999-03-04 → cancelled 2004-02-10
  • FREEMAN, ANDREW L MN
    2006-03-04 → cancelled 2008-01-29
  • Kumakura, Hiroshi IL
    2011-06-21 → cancelled 2011-09-20
  • KLEIN, STEVEN R CO
    2024-08-08 active
← Back to K0TTT License history →