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

N9OZZ callsign genealogy

Currently held by MUDERSBACH, RONALD A

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 N9OZZ's current licensee, walking backwards.

  1. AB9TMcancelled· E
    MILLER, TUCKILgranted 2018-10-16cancelled 2020-01-03
  2. NF9Tactive· E
    MILLER, TUCKILgranted 2020-01-03

Successor callsigns

Callsigns held now by people who previously held N9OZZ.

No current licensee on record previously held this callsign.

All historical holders

Every license row we've seen with the callsign N9OZZ, oldest first.

  • COURTNEY, ADAM T WI
    1992-04-14 → cancelled 2004-04-15
  • MUDERSBACH, RONALD A WI
    2019-03-21 active
← Back to N9OZZ License history →