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

K0JM callsign genealogy

Currently held by SONNEK, FRANK

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 K0JM's current licensee, walking backwards.

  1. K0MDJcancelled· E
    Johns, Mark DMNgranted 2017-07-07cancelled 2018-03-16
  2. WA0RGVcancelled· A
    JOHNS, MARK Dcancelled 1997-09-17

Successor callsigns

Callsigns held now by people who previously held K0JM.

No current licensee on record previously held this callsign.

All historical holders

Every license row we've seen with the callsign K0JM, oldest first.

  • SONNEK, FRANK SD
    2005-12-01 → cancelled 2017-10-24
  • Johns, Mark D MN
    2018-03-16 active
← Back to K0JM License history →