uls-tracker
Sign in
Confidence: Medium · Source: FCC ULS · As of 2026-09-14

AJ4OB callsign genealogy

Currently held by Chulik, John D

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 AJ4OB's current licensee, walking backwards.

  1. KJ4EMRcancelled· E
    Chulik, John DFLgranted 2005-04-21cancelled 2009-02-12
  2. KC8OOJcancelled· G
    Chulik, John DFLgranted 2005-04-21cancelled 2008-06-03
  3. KA8QWScancelled· P
    CHULIK, JOHN DOHgranted 1995-03-13cancelled 2000-05-25

Successor callsigns

Callsigns held now by people who previously held AJ4OB.

  1. W3VPactive· E
    CHULIK, JOHN DSCgranted 2018-12-10
← Back to AJ4OB License history →