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

NZ9L callsign genealogy

Currently held by KOORS, MARK 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 NZ9L's current licensee, walking backwards.

  1. N9PWIcancelled· E
    KOORS, MARK AINgranted 2012-04-09cancelled 2013-11-15

Successor callsigns

Callsigns held now by people who previously held NZ9L.

  1. N9ZUactive· E
    Osorio, Cesar AFLgranted 2021-07-28

All historical holders

Every license row we've seen with the callsign NZ9L, oldest first.

  • BENZ, NORMAN WI
    1997-02-07 → cancelled 2009-02-10
  • Osorio, Cesar A IL
    2011-02-01 → cancelled 2011-10-18
  • KOORS, MARK A IN
    2013-11-15 → cancelled 2026-03-07
← Back to NZ9L License history →