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

W9MM callsign genealogy

Currently held by Metzdorf, 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 W9MM's current licensee, walking backwards.

  1. AB9EJcancelled· E
    Metzdorf, Michael JWIgranted 2006-04-07cancelled 2006-08-22
  2. KB9NZVcancelled· E
    Metzdorf, Michael JWIgranted 1998-02-26cancelled 2002-03-15

Successor callsigns

Callsigns held now by people who previously held W9MM.

No current licensee on record previously held this callsign.

All historical holders

Every license row we've seen with the callsign W9MM, oldest first.

  • DEAN, JAMES L IN
    1998-12-23 → cancelled 2002-08-16
  • Metzdorf, Michael J WI
    2016-06-16 active
← Back to W9MM License history →