Confidence: Medium · Source: FCC ULS · As of 2026-09-12
WP4KZ callsign genealogy
Currently held by Ruiz Ramirez, Rafael 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 WP4KZ's current licensee, walking backwards.
- Ruiz Ramirez, Rafael JPRgranted 2014-12-10cancelled 2015-12-25
Successor callsigns
Callsigns held now by people who previously held WP4KZ.
No current licensee on record previously held this callsign.
All historical holders
Every license row we've seen with the callsign WP4KZ, oldest first.
- ALEJANDRO, EFRAIN PR1987-09-08 → cancelled 1999-09-10
- Ruiz Ramirez, Rafael J PR2025-11-22 active