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

KZ0ZZZ callsign genealogy

Currently held by Probst, Fred S

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 KZ0ZZZ's current licensee, walking backwards.

  1. KO4CITcancelled· T
    Singer, Randall JFLgranted 2020-03-04cancelled 2020-03-24

Successor callsigns

Callsigns held now by people who previously held KZ0ZZZ.

  1. KS1USAactive· G
    Probst, Fred SKSgranted 2019-03-06
  2. K0SNHactive· T
    Allen, Shane MWYgranted 2017-06-20

All historical holders

Every license row we've seen with the callsign KZ0ZZZ, oldest first.

  • Probst, Fred S KS
    2008-07-29 → cancelled 2009-05-15
  • Allen, Shane M CO
    2017-05-16 → cancelled 2017-06-20
  • Singer, Randall J FL
    2020-03-24 active
← Back to KZ0ZZZ License history →