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

N1CTO callsign genealogy

Currently held by Addison, Donald

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 N1CTO's current licensee, walking backwards.

  1. KE4ADDcancelled· G
    Addison, Donald RGAgranted 2016-03-12cancelled 2017-01-31
  2. KJ4OHZcancelled· T
    Addison, Donald RGAgranted 2009-08-14cancelled 2016-03-12

Successor callsigns

Callsigns held now by people who previously held N1CTO.

  1. NF8Bactive· E
    Boyle, Terrence JOHgranted 2021-04-21

All historical holders

Every license row we've seen with the callsign N1CTO, oldest first.

  • FINSTEIN, DAVID MA
    1988-03-29 → cancelled 2000-03-30
  • Boyle, Terrence J OH
    2004-03-12 → cancelled 2011-07-15
  • Addison, Donald GA
    2017-01-31 active
← Back to N1CTO License history →