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

AC0V 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 AC0V's current licensee, walking backwards.

  1. AC0YKcancelled· E
    Hartmann, Michael JCOgranted 2011-06-14cancelled 2012-02-22
  2. WB6VUYcancelled· E
    Hartmann, Michael JCOgranted 2011-06-14cancelled 2012-01-10
  3. KC5EUUcancelled· G
    Hartmann, Michael JCOgranted 2003-11-18cancelled 2011-06-14

Successor callsigns

Callsigns held now by people who previously held AC0V.

No current licensee on record previously held this callsign.

All historical holders

Every license row we've seen with the callsign AC0V, oldest first.

  • NIESEN, JAMES M MN
    1999-11-24 → cancelled 2012-01-31
  • Hartmann, Michael J CO
    2022-01-21 active
← Back to AC0V License history →