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

K4HK callsign genealogy

Currently held by MARTIN III, ROBERT J

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 K4HK's current licensee, walking backwards.

  1. K2USUcancelled· E
    COTTRELL, ALAN BMIgranted 2007-08-17cancelled 2009-07-24
  2. K2UHcancelled· E
    Kaplan, JonFLgranted 2025-12-09cancelled 2026-02-27
  3. K5OOOcancelled· E
    Kaplan, JonFLgranted 2025-05-09cancelled 2025-12-09
  4. KR4DITcancelled· T
    Kaplan, JonFLgranted 2025-04-19cancelled 2025-05-09

Successor callsigns

Callsigns held now by people who previously held K4HK.

No current licensee on record previously held this callsign.

All historical holders

Every license row we've seen with the callsign K4HK, oldest first.

  • MARTIN III, ROBERT J VA
    1997-07-03 → cancelled 2009-07-04
  • Mulray, Ashley B FL
    2019-06-25 active
← Back to K4HK License history →