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

K0JK callsign genealogy

Currently held by LORENZ, JOHN M

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 K0JK's current licensee, walking backwards.

  1. K0WCEcancelled· E
    Knowles, Jonathan WMNgranted 2008-05-31cancelled 2008-10-21
  2. KC0WCEcancelled· E
    Knowles, Jonathan WMNgranted 2006-03-02cancelled 2008-05-31

Successor callsigns

Callsigns held now by people who previously held K0JK.

  1. K0JMLactive· E
    LORENZ, JOHN MMNgranted 2026-07-07

All historical holders

Every license row we've seen with the callsign K0JK, oldest first.

  • LORENZ, JOHN M MN
    1996-11-04 → cancelled 2006-09-30
  • Knowles, Jonathan W MN
    2018-08-14 active
← Back to K0JK License history →