Confidence: Medium · Source: FCC ULS · As of 2026-09-14
WP4KSI callsign genealogy
Currently held by TRINIDAD DIAZ, MANUEL E
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 WP4KSI's current licensee, walking backwards.
- TRINIDAD, MANUEL EPRgranted 2020-06-15cancelled 2020-07-03
Successor callsigns
Callsigns held now by people who previously held WP4KSI.
No current licensee on record previously held this callsign.
All historical holders
Every license row we've seen with the callsign WP4KSI, oldest first.
- TRINIDAD DIAZ, MANUEL E PR1991-11-26 → cancelled 2003-11-27
- TRINIDAD, MANUEL E PR2020-07-03 active