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

K4JEM callsign genealogy

Currently held by ALLEN, SPENCER M

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 K4JEM's current licensee, walking backwards.

  1. KN4LPDcancelled· E
    MCGUIRE, JACK EALgranted 2018-04-17cancelled 2018-07-17

Successor callsigns

Callsigns held now by people who previously held K4JEM.

  1. KM5ZKexpired· A
    ALLEN, SPENCER MNMgranted 2010-01-05cancelled 2022-01-06

All historical holders

Every license row we've seen with the callsign K4JEM, oldest first.

  • ALLEN, SPENCER M NM
    2010-01-05 → cancelled 2015-08-11
  • MCGUIRE, JACK E AL
    2018-07-17 active
← Back to K4JEM License history →