Confidence: Medium · Source: FCC ULS · As of 2026-09-12
WP4SA callsign genealogy
Currently held by MONTALVO ABRANTE, WILBERTO
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 WP4SA's current licensee, walking backwards.
- MONTALVO ABRANTE, WILBERTOPRgranted 2018-05-07cancelled 2021-03-02
Successor callsigns
Callsigns held now by people who previously held WP4SA.
No current licensee on record previously held this callsign.
All historical holders
Every license row we've seen with the callsign WP4SA, oldest first.
- DIAZ, JOSE R PR1988-11-22 → cancelled 2000-11-28
- MONTALVO ABRANTE, WILBERTO PR2021-03-02 active