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

W6EZU 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 W6EZU's current licensee, walking backwards.

  1. N5MJKactive· E
    KIEFER, MICHAEL JTXgranted 2017-11-28
  2. KB3QKFcancelled· E
    KIEFER, MICHAEL JTXgranted 2016-06-07cancelled 2017-11-28
  3. KB9NUXcancelled· G
    Kiefer, Michael JDEgranted 2006-05-18cancelled 2008-02-15

Successor callsigns

Callsigns held now by people who previously held W6EZU.

  1. AE6Fcancelled· E
    KAZMIERCZAK, MICHAEL JOKgranted 2014-03-28cancelled 2016-07-29
  2. N5MJKcancelled· G
    KAZMIERCZAK, MICHAEL JOKgranted 2011-06-07cancelled 2011-06-29

All historical holders

Every license row we've seen with the callsign W6EZU, oldest first.

  • KAZMIERCZAK, MICHAEL J OK
    2007-06-02 → cancelled 2011-06-07
  • KAZMIERCZAK, MICHAEL J OK
    2011-06-29 → cancelled 2014-03-28
← Back to W6EZU License history →