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

KT9I callsign genealogy

Currently held by Ristrom, Dale L

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 KT9I's current licensee, walking backwards.

  1. K9REVcancelled· E
    WILLIAMS, HAROLD WINgranted 2018-03-30cancelled 2019-11-13
  2. KB9OGUcancelled· T
    WILLIAMS, HAROLD WINgranted 2016-09-21cancelled 2018-03-30

Successor callsigns

Callsigns held now by people who previously held KT9I.

No current licensee on record previously held this callsign.

All historical holders

Every license row we've seen with the callsign KT9I, oldest first.

  • Ristrom, Dale L WI
    2007-07-03 → cancelled 2019-09-18
  • WILLIAMS, HAROLD W IN
    2019-11-13 active
← Back to KT9I License history →