Confidence: Medium · Source: FCC ULS · As of 2026-09-11
NP4CS callsign genealogy
Currently held by SIEVENS IRIZARRY, CARMEN
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 NP4CS's current licensee, walking backwards.
- SIEVENS IRIZARRY, CARMENPRgranted 2020-02-24cancelled 2020-11-10
Successor callsigns
Callsigns held now by people who previously held NP4CS.
No current licensee on record previously held this callsign.