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

KC3KOS callsign genealogy

Currently held by STERNTHAL, JONATHAN W

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 KC3KOS's current licensee, walking backwards.

  1. N8JWScancelled· G
    STERNTHAL, JONATHAN WOHgranted 2024-03-22cancelled 2025-12-12
  2. KE8ZOTcancelled· G
    STERNTHAL, JONATHAN WOHgranted 2022-02-12cancelled 2024-03-22
  3. K8EVLcancelled· G
    STERNTHAL, JONATHAN WOHgranted 2022-02-12cancelled 2023-11-28
  4. K3JWSactive· T
    Stramler, Jackson WORgranted 2024-03-22
  5. KK7ROPcancelled· T
    Stramler, Jackson WORgranted 2024-02-29cancelled 2024-03-22

Successor callsigns

Callsigns held now by people who previously held KC3KOS.

  1. N8JWScancelled· G
    STERNTHAL, JONATHAN WPAgranted 2018-02-16cancelled 2019-08-13

All historical holders

Every license row we've seen with the callsign KC3KOS, oldest first.

  • STERNTHAL, JONATHAN W PA
    2018-01-12 → cancelled 2018-02-16
  • STERNTHAL, JONATHAN W OH
    2025-12-12 active
← Back to KC3KOS License history →