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

WB9O callsign genealogy

Currently held by MONIO, WILLIAM J

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 WB9O's current licensee, walking backwards.

  1. N0PDMcancelled· E
    MONIO, WILLIAM JMNgranted 2021-06-21cancelled 2023-02-25
  2. KB0DNJ
    no FCC ULS record on file

Successor callsigns

Callsigns held now by people who previously held WB9O.

  1. WT0Ucancelled· E
    HANSEN, JOHN FSDgranted 2021-02-06cancelled 2021-11-13

All historical holders

Every license row we've seen with the callsign WB9O, oldest first.

  • HANSEN, JOHN F SD
    2020-03-12 → cancelled 2021-02-06
  • MONIO, WILLIAM J MN
    2023-02-25 active
← Back to WB9O License history →