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

WZ4M callsign genealogy

Currently held by BROCK JR, JOHN L

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 WZ4M's current licensee, walking backwards.

  1. W4TZMcancelled· E
    MITCHELL III, THOMAS ZNCgranted 2011-04-01cancelled 2016-02-20
  2. KK4AGDcancelled· G
    MITCHELL III, THOMAS ZNCgranted 2011-02-14cancelled 2011-04-01

Successor callsigns

Callsigns held now by people who previously held WZ4M.

No current licensee on record previously held this callsign.

All historical holders

Every license row we've seen with the callsign WZ4M, oldest first.

  • BROCK JR, JOHN L FL
    2004-01-22 → cancelled 2016-02-02
  • MITCHELL III, THOMAS Z NC
    2025-11-27 active
← Back to WZ4M License history →