Confidence: Medium · Source: FCC ULS · As of 2026-09-12
NP4DX callsign genealogy
Currently held by ATLANTIC CONTEST CLUB
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 NP4DX's current licensee, walking backwards.
Successor callsigns
Callsigns held now by people who previously held NP4DX.
No current licensee on record previously held this callsign.
All historical holders
Every license row we've seen with the callsign NP4DX, oldest first.
- MALDONADO CINTRON, ADA N PR1998-04-21 → cancelled 1999-12-24
- ATLANTIC CONTEST CLUB PR2020-01-14 active