uls-tracker
Sign in
Confidence: Medium · Source: FCC ULS · As of 2026-09-12

N9ADR 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 N9ADR's current licensee, walking backwards.

  1. AC9JPcancelled· E
    SIERP, MATTHEW DINgranted 2023-05-17cancelled 2024-04-19
  2. AC9JOcancelled· E
    SIERP, MATTHEW DINgranted 2013-05-14cancelled 2014-10-10
  3. AC9DRcancelled· E
    Roberson, Donald HOHgranted 2021-02-27cancelled 2021-07-30
  4. W9DHRcancelled· E
    Roberson, DonaldWIgranted 2020-02-14cancelled 2021-02-27
  5. N9DHRcancelled· E
    Roberson, Donald HWIgranted 2018-07-31cancelled 2020-02-14
  6. AD9DRactive· E
    REAVIS, DENNIS RILgranted 2021-05-14
  7. KC9IRLcancelled· E
    REAVIS, DENNIS RILgranted 2015-11-10cancelled 2021-05-14

Successor callsigns

Callsigns held now by people who previously held N9ADR.

  1. AK4OEcancelled· E
    SIERP, MATTHEW DINgranted 2003-05-13cancelled 2012-12-04

All historical holders

Every license row we've seen with the callsign N9ADR, oldest first.

  • SIERP, MATTHEW D FL
    2003-05-13 → cancelled 2011-11-15
  • SIERP, MATTHEW D IN
    2024-04-19 active
← Back to N9ADR License history →