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

K4JMS callsign genealogy

Currently held by Mayer III, Joseph W

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 K4JMS's current licensee, walking backwards.

  1. KF4JMScancelled· T
    SHEARER, JOHN MNCgranted 2018-07-13cancelled 2018-11-17
  2. KI4JGWcancelled· T
    SHEARER, JOHN MNCgranted 2015-02-19cancelled 2018-07-13

Successor callsigns

Callsigns held now by people who previously held K4JMS.

  1. N5JWMactive· E
    Mayer III, Joseph WTXgranted 2026-08-01

All historical holders

Every license row we've seen with the callsign K4JMS, oldest first.

  • BERG, HERBERT P FL
    1996-04-01 → cancelled 2008-04-02
  • Mayer III, Joseph W TX
    2009-10-27 → cancelled 2016-10-29
  • SHEARER, JOHN M NC
    2018-11-17 active
← Back to K4JMS License history →