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

WP4KJ callsign genealogy

Currently held by LOPEZ, JUAN

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 WP4KJ's current licensee, walking backwards.

  1. KP3KJcancelled· T
    Lopez-Garcia, Juan EPRgranted 2005-03-04cancelled 2009-09-12
  2. WP3ZUcancelled· T
    Lopez-Garcia, Juan EPRgranted 2004-03-03cancelled 2005-03-04

Successor callsigns

Callsigns held now by people who previously held WP4KJ.

  1. KP4KJactive· E
    LOPEZ, JUANPRgranted 2021-04-20

All historical holders

Every license row we've seen with the callsign WP4KJ, oldest first.

  • MARCANO, WILLIAM PR
    1987-08-11 → cancelled 1999-08-16
  • LOPEZ, JUAN PR
    2019-06-18 → cancelled 2021-04-20
← Back to WP4KJ License history →