Confidence: Medium · Source: FCC ULS · As of 2026-09-12
WP4SD callsign genealogy
Currently held by MARTINEZ, PRIMITIVO
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 WP4SD's current licensee, walking backwards.
- TORRES, VICTORPRgranted 2010-07-06cancelled 2010-11-19
Successor callsigns
Callsigns held now by people who previously held WP4SD.
No current licensee on record previously held this callsign.
All historical holders
Every license row we've seen with the callsign WP4SD, oldest first.
- MARTINEZ, PRIMITIVO PR1988-11-22 → cancelled 2000-11-28
- TORRES, VICTOR PR2020-11-02 active