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

KD9OCK callsign genealogy

Currently held by Zimmerman, Russell 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 KD9OCK's current licensee, walking backwards.

  1. K9XLXcancelled· T
    Zimmerman, Russell AWIgranted 2020-12-29cancelled 2021-03-23

Successor callsigns

Callsigns held now by people who previously held KD9OCK.

  1. K9XLXcancelled· T
    Zimmerman, Russell AWIgranted 2020-12-29cancelled 2021-03-23

All historical holders

Every license row we've seen with the callsign KD9OCK, oldest first.

  • Zimmerman, Russell A WI
    2019-10-25 → cancelled 2020-12-29
  • Zimmerman, Russell A WI
    2021-03-23 active
← Back to KD9OCK License history →