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

AH6RT callsign genealogy

Currently held by Isobe, Michael K

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 AH6RT's current licensee, walking backwards.

  1. NH6DVcancelled· E
    ISOBE, MICHAEL KHIgranted 2021-02-19cancelled 2022-04-30

Successor callsigns

Callsigns held now by people who previously held AH6RT.

  1. KH6Iactive· E
    Isobe, Michael KHIgranted 2024-03-01
  2. NS5Oexpired· E
    HALBERT, JASON PTXgranted 2005-08-19cancelled 2017-08-22

All historical holders

Every license row we've seen with the callsign AH6RT, oldest first.

  • HALBERT, JASON P TX
    2002-04-04 → cancelled 2005-08-19
  • Isobe, Michael K HI
    2022-04-30 → cancelled 2024-03-01
← Back to AH6RT License history →