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

KN9U callsign genealogy

Currently held by Rosenquist, Matthew 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 KN9U's current licensee, walking backwards.

  1. KG4IPMcancelled· E
    Rosenquist, Matthew AFLgranted 2020-05-06cancelled 2021-05-04

Successor callsigns

Callsigns held now by people who previously held KN9U.

  1. K3BPcancelled· E
    YOUNG, ROBERT BINgranted 2019-03-30cancelled 2019-04-27

All historical holders

Every license row we've seen with the callsign KN9U, oldest first.

  • OLSON, DONALD G WI
    2006-08-30 → cancelled 2018-11-27
  • YOUNG, ROBERT B IN
    2018-12-15 → cancelled 2019-03-30
  • Rosenquist, Matthew A PA
    2021-05-04 active
← Back to KN9U License history →