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

W9MSS callsign genealogy

Currently held by Schweiner, Maxwell S

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 W9MSS's current licensee, walking backwards.

  1. KC9YLGcancelled· T
    Schweiner, Maxwell SWIgranted 2013-03-01cancelled 2013-09-13

Successor callsigns

Callsigns held now by people who previously held W9MSS.

  1. WR4Aactive· E
    Shamrock Sr, Mark AFLgranted 2021-02-09
  2. W9QTactive· E
    Schweiner, Maxwell SWIgranted 2017-12-22

All historical holders

Every license row we've seen with the callsign W9MSS, oldest first.

  • Shamrock Sr, Mark A FL
    2009-06-05 → cancelled 2011-04-26
  • Schweiner, Maxwell S WI
    2013-09-13 → cancelled 2017-12-22
← Back to W9MSS License history →