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

AC0YK callsign genealogy

Currently held by Hartmann, 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 AC0YK's current licensee, walking backwards.

  1. WB6VUYcancelled· E
    Hartmann, Michael JCOgranted 2011-06-14cancelled 2012-01-10
  2. KC5EUUcancelled· G
    Hartmann, Michael JCOgranted 2003-11-18cancelled 2011-06-14

Successor callsigns

Callsigns held now by people who previously held AC0YK.

  1. AC0Vactive· E
    Hartmann, Michael JCOgranted 2022-01-21
← Back to AC0YK License history →