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Confidence: Medium · Source: FCC ULS · As of 2026-09-14

N9UM callsign genealogy

Currently held by Thomas, Mark A

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 N9UM's current licensee, walking backwards.

  1. KG9PFcancelled· E
    Thomas, Mark AILgranted 1999-02-10cancelled 2002-11-16
  2. KB9LIOcancelled· T
    THOMAS, MARK Acancelled 1999-02-10

Successor callsigns

Callsigns held now by people who previously held N9UM.

No current licensee on record previously held this callsign.

← Back to N9UM License history →