Confidence: Medium · Source: FCC ULS · As of 2026-09-12
WP4TM callsign genealogy
Currently held by TORRES, 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 WP4TM's current licensee, walking backwards.
Successor callsigns
Callsigns held now by people who previously held WP4TM.
No current licensee on record previously held this callsign.
All historical holders
Every license row we've seen with the callsign WP4TM, oldest first.
- TORRES, JUAN PR1999-03-09 → cancelled 2011-03-10
- ESTRADA, JOSE J PR2022-08-04 active