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

K1ZH callsign genealogy

Currently held by Ritzenthaler, David M

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 K1ZH's current licensee, walking backwards.

  1. AD1Iactive· E
    VARNER, BRIAN RFLgranted 2016-12-24
  2. W4VARcancelled· E
    VARNER, BRIAN RFLgranted 2014-02-25cancelled 2016-12-24
  3. KK4WHAcancelled· G
    VARNER, BRIAN RFLgranted 2014-01-09cancelled 2014-02-25

Successor callsigns

Callsigns held now by people who previously held K1ZH.

  1. AE7YBactive· E
    Ritzenthaler, David MWAgranted 2023-02-08

All historical holders

Every license row we've seen with the callsign K1ZH, oldest first.

  • Ritzenthaler, David M WA
    2003-05-06 → cancelled 2012-11-14
  • Mentele, Steven F SD
    2024-11-30 active
← Back to K1ZH License history →