Confidence: Medium · Source: FCC ULS · As of 2026-09-12
NP4SS callsign genealogy
Currently held by SOTO, JUAN D
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 NP4SS's current licensee, walking backwards.
- SOTO-GONZALEZ, JUAN DPRgranted 2008-05-12cancelled 2018-02-21
Successor callsigns
Callsigns held now by people who previously held NP4SS.
No current licensee on record previously held this callsign.
All historical holders
Every license row we've seen with the callsign NP4SS, oldest first.
- MERCADO, JOSE PR1995-11-28 → cancelled 2007-11-29
- SOTO, JUAN D PR2018-02-21 active