uls-tracker
Sign in
Confidence: Medium · Source: FCC ULS · As of 2026-09-12

WS6O callsign genealogy

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 WS6O's current licensee, walking backwards.

  1. W8AGQcancelled· E
    Zientak, Michael JMIgranted 2026-02-24cancelled 2026-06-05
  2. KF8FQRcancelled· T
    Zientak, Michael JMIgranted 2026-01-23cancelled 2026-02-24

Successor callsigns

Callsigns held now by people who previously held WS6O.

  1. N6OXactive· E
    GRIMMICK, ROBERT WAZgranted 2018-08-29

All historical holders

Every license row we've seen with the callsign WS6O, oldest first.

  • Wisniewski, Walter H CA
    2014-03-19 → cancelled 2026-05-12
  • Zientak, Michael J MI
    2026-06-05 active
  • —
    — → cancelled 1998-09-23
← Back to WS6O License history →