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

KB4MK callsign genealogy

Currently held by KLINGER, MARTIN F

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 KB4MK's current licensee, walking backwards.

  1. WB4SXDcancelled· A
    KLINGER, MARTIN FFLgranted 2006-05-30cancelled 2013-09-17

Successor callsigns

Callsigns held now by people who previously held KB4MK.

  1. N4MAKcancelled· E
    Kelly, Michael ANCgranted 2010-04-27cancelled 2012-01-10

All historical holders

Every license row we've seen with the callsign KB4MK, oldest first.

  • CLODFELTER, BOYCE A VA
    1992-06-16 → cancelled 2004-06-17
  • Kelly, Michael A NC
    2006-11-10 → cancelled 2010-04-27
  • KLINGER, MARTIN F FL
    2013-09-17 → cancelled 2025-09-18
← Back to KB4MK License history →