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

K0IZ callsign genealogy

Currently held by CLAPPER, TIMOTHY W

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 K0IZ's current licensee, walking backwards.

  1. K0LMZactive· T
    KLEMZ, DANIEL WMNgranted 2018-06-12
  2. KE0RNHcancelled· T
    KLEMZ, DANIEL WMNgranted 2018-05-01cancelled 2018-06-12

Successor callsigns

Callsigns held now by people who previously held K0IZ.

  1. KR3Ccancelled· E
    CLAPPER, TIMOTHY WPAgranted 2001-05-20cancelled 2002-08-20

All historical holders

Every license row we've seen with the callsign K0IZ, oldest first.

  • CLAPPER, TIMOTHY W CO
    2000-11-07 → cancelled 2001-05-20
  • RAYDO, JOHN S CO
    2023-03-14 active
← Back to K0IZ License history →