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

N9OZ callsign genealogy

Currently held by WESTERMEIER, MARK R

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 N9OZ's current licensee, walking backwards.

  1. KC9QAZcancelled· E
    WESTERMEIER, MARK RINgranted 2002-04-12cancelled 2009-07-18
  2. K9ALQcancelled· T
    WESTERMEIER, MARK RINgranted 2002-04-12cancelled 2009-06-20
  3. W1CIAactive· A
    Haaker, Donald RMAgranted 2015-05-19
  4. WA1AICcancelled· A
    Haaker, Donald RMAgranted 1998-04-09cancelled 2005-07-26

Successor callsigns

Callsigns held now by people who previously held N9OZ.

No current licensee on record previously held this callsign.

All historical holders

Every license row we've seen with the callsign N9OZ, oldest first.

  • SLADEK, DENNIS L IL
    1997-06-09 → cancelled 2009-06-10
  • WESTERMEIER, MARK R IN
    2019-06-25 active
← Back to N9OZ License history →