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

W9WWW 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 W9WWW's current licensee, walking backwards.

  1. K0TTTactive· G
    KLEIN, STEVEN RCOgranted 2024-08-08
  2. KD0YKFcancelled· G
    KLEIN, STEVEN RCOgranted 2013-12-03cancelled 2014-09-05

Successor callsigns

Callsigns held now by people who previously held W9WWW.

  1. W9ARTactive· E
    VISSER, ARTHUR DINgranted 2019-08-27

All historical holders

Every license row we've seen with the callsign W9WWW, oldest first.

  • OPPERT, HARRY C WI
    1997-05-20 → cancelled 2009-05-21
  • VISSER, ARTHUR D IN
    2009-08-04 → cancelled 2009-09-01
  • Kumakura, Hiroshi IL
    2021-11-27 active
← Back to W9WWW License history →