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

K0IO callsign genealogy

Currently held by NELSON, JOHN H

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 K0IO's current licensee, walking backwards.

  1. AE0OOcancelled· E
    Scarisbrick, Aaron MCOgranted 2017-03-14cancelled 2021-12-10
  2. W7LEXactive· G
    OYLER Mr, WAYNE AUTgranted 2024-09-10
  3. KK7SXRcancelled· G
    OYLER, WAYNE AUTgranted 2024-04-24cancelled 2024-09-10

Successor callsigns

Callsigns held now by people who previously held K0IO.

No current licensee on record previously held this callsign.

All historical holders

Every license row we've seen with the callsign K0IO, oldest first.

  • NELSON, JOHN H IA
    2017-04-24 → cancelled 2019-11-21
  • Scarisbrick, Aaron M UT
    2021-12-10 active
← Back to K0IO License history →