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

W1UM callsign genealogy

Currently held by Merck, Ryan D

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 W1UM's current licensee, walking backwards.

  1. KD1Xactive· E
    Segerson, Philip JMAgranted 2021-12-03
  2. W1XVXcancelled· E
    Segerson, Philip JMAgranted 2021-01-26cancelled 2021-12-03
  3. KC1OKEcancelled· G
    Segerson, Philip JMAgranted 2021-01-07cancelled 2021-01-26

Successor callsigns

Callsigns held now by people who previously held W1UM.

No current licensee on record previously held this callsign.

All historical holders

Every license row we've seen with the callsign W1UM, oldest first.

  • RADIO SOCIETY MI
    1997-10-09 → cancelled 1999-06-23
  • Couvillon Jr, Lucien A MA
    2012-01-25 → cancelled 2017-10-23
  • Merck, Ryan D MA
    2019-11-13 active
← Back to W1UM License history →