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

K8ZOO callsign genealogy

Currently held by GREATER CLEVELAND AMATEUR RADIO COMMITTEE

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 K8ZOO's current licensee, walking backwards.

  1. N8TTTactive· T
    MAGNUSSON, JOHNUTgranted 2024-05-18
  2. KK7TAEcancelled· T
    MAGNUSSON, JOHNUTgranted 2024-04-30cancelled 2024-05-18

Successor callsigns

Callsigns held now by people who previously held K8ZOO.

  1. N8TTTcancelled· E
    GROCKI, PHILIP SMIgranted 2020-04-14cancelled 2022-03-12

All historical holders

Every license row we've seen with the callsign K8ZOO, oldest first.

  • GREATER CLEVELAND AMATEUR RADIO COMMITTEE OH
    1998-10-05 → cancelled 2010-10-06
  • GROCKI, PHILIP S MI
    2012-03-23 → cancelled 2020-04-14
  • GROCKI, PHILIP S MI
    2022-03-12 active
← Back to K8ZOO License history →