Confidence: Medium · Source: FCC ULS · As of 2026-09-12
NP4FS callsign genealogy
Currently held by SOBERAL CRUZ, FELIPE O
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 NP4FS's current licensee, walking backwards.
- SOBERAL CRUZ, FELIPE OPRgranted 2018-02-09cancelled 2022-01-19
Successor callsigns
Callsigns held now by people who previously held NP4FS.
No current licensee on record previously held this callsign.
All historical holders
Every license row we've seen with the callsign NP4FS, oldest first.
- NIEVES SR, MIGUEL A NY1989-08-08 → cancelled 2001-08-09
- SOBERAL CRUZ, FELIPE O PR2022-01-19 active