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

AC9JO callsign genealogy

Currently held by SIERP, MATTHEW D

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 AC9JO's current licensee, walking backwards.

  1. AC9DRcancelled· E
    Roberson, Donald HOHgranted 2021-02-27cancelled 2021-07-30
  2. W9DHRcancelled· E
    Roberson, DonaldWIgranted 2020-02-14cancelled 2021-02-27
  3. N9DHRcancelled· E
    Roberson, Donald HWIgranted 2018-07-31cancelled 2020-02-14
  4. AD9DRactive· E
    REAVIS, DENNIS RILgranted 2021-05-14
  5. KC9IRLcancelled· E
    REAVIS, DENNIS RILgranted 2015-11-10cancelled 2021-05-14

Successor callsigns

Callsigns held now by people who previously held AC9JO.

  1. AC9JPcancelled· E
    SIERP, MATTHEW DINgranted 2023-05-17cancelled 2024-04-19
← Back to AC9JO License history →