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

KO5KW callsign genealogy

Currently held by KAZMIERCZAK, MICHAEL 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 KO5KW's current licensee, walking backwards.

  1. AE6Factive· E
    ROWLEY, KARL PCAgranted 2024-09-21
  2. KS6Jcancelled· E
    ROWLEY, KARL PCAgranted 2024-02-09cancelled 2024-09-21
  3. N6KAAcancelled· E
    ROWLEY, KARL PCAgranted 2023-11-14cancelled 2024-02-09
  4. KG6MAWcancelled· G
    ROWLEY, KARL PCAgranted 2022-07-22cancelled 2023-11-14

Successor callsigns

Callsigns held now by people who previously held KO5KW.

  1. KZ5Xactive· E
    KAZMIERCZAK, MICHAEL JTXgranted 2024-05-17
  2. AE6Fcancelled· E
    KAZMIERCZAK, MICHAEL JNMgranted 2018-02-17cancelled 2022-08-30

All historical holders

Every license row we've seen with the callsign KO5KW, oldest first.

  • KAZMIERCZAK, MICHAEL J OK
    2016-07-29 → cancelled 2018-02-17
  • KAZMIERCZAK, MICHAEL J CA
    2022-08-30 → cancelled 2024-05-17
← Back to KO5KW License history →