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

NJ1O callsign genealogy

Currently held by KEEF, WILLIAM,G

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 NJ1O's current licensee, walking backwards.

  1. W1IMSactive· E
    Rohr, Thomas EINgranted 2024-10-18
  2. N9MERcancelled· T
    Rohr, Thomas EINgranted 2004-01-03cancelled 2004-02-07
  3. KC9BKWcancelled· T
    Rohr, Thomas EINgranted 2002-04-02cancelled 2004-01-03

Successor callsigns

Callsigns held now by people who previously held NJ1O.

  1. W1IMScancelled· E
    KEEF, WILLIAM GMEgranted 1999-02-23cancelled 2001-05-11

All historical holders

Every license row we've seen with the callsign NJ1O, oldest first.

  • KEEF, WILLIAM G ME
    2021-04-28 active
  • KEEF, WILLIAM,G
    — → cancelled 1999-02-23
← Back to NJ1O License history →