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Confidence: Medium · Source: FCC ULS · As of 2026-09-14

KZ4TKW callsign genealogy

Currently held by Harrington, Todd P

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 KZ4TKW's current licensee, walking backwards.

  1. KM4JAWcancelled· T
    Harrington, Todd PNCgranted 2014-09-30cancelled 2018-10-12
  2. KM4BDIcancelled· T
    Harrington, Todd PALgranted 2014-05-09cancelled 2014-09-30

Successor callsigns

Callsigns held now by people who previously held KZ4TKW.

  1. KZ4SBGcancelled· T
    Harrington, Todd PFLgranted 2019-04-12cancelled 2025-08-26
← Back to KZ4TKW License history →