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

W9CZK callsign genealogy

Currently held by WIRTH, JON C

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 W9CZK's current licensee, walking backwards.

  1. KD9KIJcancelled· G
    Pacovsky, Christopher JINgranted 2018-02-26cancelled 2019-03-05

Successor callsigns

Callsigns held now by people who previously held W9CZK.

  1. NN5Nactive· E
    PACOVSKY, CHRISTOPHER JINgranted 2024-04-05
  2. WN7AAexpired· A
    WIRTH, JON CIDgranted 2013-08-14cancelled 2026-03-06

All historical holders

Every license row we've seen with the callsign W9CZK, oldest first.

  • WIRTH, JON C WI
    1994-03-15 → cancelled 2003-11-01
  • PACOVSKY, CHRISTOPHER J IN
    2019-03-05 → cancelled 2024-04-05
← Back to W9CZK License history →