Confidence: Medium · Source: FCC ULS · As of 2026-09-14
WP4JPA callsign genealogy
Currently held by PEREZ, JOSE F
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 WP4JPA's current licensee, walking backwards.
- PEREZ, JOSE FPRgranted 2021-05-21cancelled 2021-06-22
Successor callsigns
Callsigns held now by people who previously held WP4JPA.
- CASTILLO, LIBORIO (OLIVO)PRgranted 2018-11-24
All historical holders
Every license row we've seen with the callsign WP4JPA, oldest first.
- PEREZ, JOSE F PR2021-06-22 active
- CASTILLO, LIBORIO— → cancelled 1999-01-08