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

N9ZU callsign genealogy

Currently held by Ryan, Patrick L

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 N9ZU's current licensee, walking backwards.

  1. NZ9Lexpired· E
    KOORS, MARK AINgranted 2013-11-15cancelled 2026-03-07
  2. N9PWIcancelled· E
    KOORS, MARK AINgranted 2012-04-09cancelled 2013-11-15

Successor callsigns

Callsigns held now by people who previously held N9ZU.

  1. KD9XMactive· E
    Ryan, Patrick LWIgranted 2019-08-10

All historical holders

Every license row we've seen with the callsign N9ZU, oldest first.

  • Ryan, Patrick L WI
    2005-07-15 → cancelled 2009-09-29
  • Osorio, Cesar A FL
    2021-07-28 active
← Back to N9ZU License history →