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

K9RUF callsign genealogy

Currently held by HOLMGREN, DAVID J

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 K9RUF's current licensee, walking backwards.

  1. K5TARactive· G
    Vincent, RyanLAgranted 2023-02-07
  2. KI5TFBcancelled· T
    Vincent, RyanLAgranted 2022-01-06cancelled 2023-02-07

Successor callsigns

Callsigns held now by people who previously held K9RUF.

  1. K9ATactive· E
    HOLMGREN, DAVID JILgranted 2019-05-03

All historical holders

Every license row we've seen with the callsign K9RUF, oldest first.

  • HOLMGREN, DAVID J IL
    2016-12-28 → cancelled 2019-05-03
  • THE NORTHERN ILLINOIS DIGITAL CLUB IL
    2021-01-19 active
← Back to K9RUF License history →