uls-tracker
Sign in
Confidence: Medium · Source: FCC ULS · As of 2026-09-12

AJ4EP callsign genealogy

Currently held by Rivera, Osvaldo

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 AJ4EP's current licensee, walking backwards.

  1. KP4LEUcancelled· E
    Rivera, OsvaldoFLgranted 2002-07-16cancelled 2008-01-23
  2. WP3KScancelled· G
    Rivera-Soto, OsvaldoPRgranted 2001-05-02cancelled 2002-07-16

Successor callsigns

Callsigns held now by people who previously held AJ4EP.

  1. KB4OZexpired· E
    Rivera, OsvaldoFLgranted 2008-02-15cancelled 2020-02-19
← Back to AJ4EP License history →