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Confidence: Medium · Source: FCC ULS · As of 2026-09-12

N1TZ callsign genealogy

Currently held by CZAJKOWSKI, ROBERT J

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 N1TZ's current licensee, walking backwards.

  1. KD4WAVcancelled· E
    KASSA, BRIAN TWAgranted 2002-11-13cancelled 2012-10-27

Successor callsigns

Callsigns held now by people who previously held N1TZ.

  1. N7MFcancelled
    Western States Contest ClubCAgranted 2021-04-22cancelled 2025-09-06

All historical holders

Every license row we've seen with the callsign N1TZ, oldest first.

  • CZAJKOWSKI, ROBERT J MA
    2000-11-28 → cancelled 2005-06-15
  • Western States Contest Club CA
    2010-08-31 → cancelled 2010-10-05
  • KASSA, BRIAN T TX
    2022-08-02 active
← Back to N1TZ License history →