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

W0MSR callsign genealogy

Currently held by RYAN, MARK 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 W0MSR's current licensee, walking backwards.

  1. KI0QFcancelled· A
    RYAN, MARK SNEgranted 1999-06-03cancelled 2000-04-25
  2. KC0CLBcancelled· G
    RYAN, MARK Scancelled 1999-06-03

Successor callsigns

Callsigns held now by people who previously held W0MSR.

  1. W5MSRactive· E
    RYAN, MARK STXgranted 2018-11-08
← Back to W0MSR License history →