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

W1US callsign genealogy

Currently held by THOMPSON, MICHAEL 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 W1US's current licensee, walking backwards.

  1. N1IMDcancelled· E
    THOMPSON, MICHAEL SNHgranted 2002-03-26cancelled 2009-04-10
  2. KU1Dactive· E
    Tanaka, MasaruCTgranted 2021-08-30
  3. AB1PTcancelled· E
    Tanaka, MasaruCTgranted 2011-09-28cancelled 2011-11-15

Successor callsigns

Callsigns held now by people who previously held W1US.

No current licensee on record previously held this callsign.

All historical holders

Every license row we've seen with the callsign W1US, oldest first.

  • KELEMEN, ROBERT J VT
    2006-05-13 → cancelled 2007-03-22
  • THOMPSON, MICHAEL S NH
    2019-01-30 active
← Back to W1US License history →