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

AJ4RK callsign genealogy

Currently held by KIRKPATRICK, JOHN R

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 AJ4RK's current licensee, walking backwards.

  1. AJ6TWcancelled· E
    KLINGER, ROBERT MMIgranted 2018-03-20cancelled 2018-05-18
  2. W9BOBactive· G
    Rutkowski, Robert FILgranted 2020-12-01
  3. KD9QWOcancelled· G
    Rutkowski, Robert FILgranted 2020-11-12cancelled 2020-12-01

Successor callsigns

Callsigns held now by people who previously held AJ4RK.

  1. WU2Tactive· E
    KIRKPATRICK, JOHN RSCgranted 2022-08-20
  2. AB2Aactive· E
    Klinger, Robert MMIgranted 2019-04-16

All historical holders

Every license row we've seen with the callsign AJ4RK, oldest first.

  • KIRKPATRICK, JOHN R SC
    2006-06-17 → cancelled 2012-10-16
  • KLINGER, ROBERT M MI
    2018-05-18 → cancelled 2019-04-16
← Back to AJ4RK License history →