Confidence: Medium · Source: FCC ULS · As of 2026-09-12
NP4HL callsign genealogy
Currently held by Rosario-Rivera, Hiram I
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 NP4HL's current licensee, walking backwards.
- Rosario-Rivera, Hiram IPRgranted 2020-03-10cancelled 2020-05-12
Successor callsigns
Callsigns held now by people who previously held NP4HL.
No current licensee on record previously held this callsign.
All historical holders
Every license row we've seen with the callsign NP4HL, oldest first.
- COLON, IVONNE PR2003-12-11 → cancelled 2015-12-12
- Rosario-Rivera, Hiram I PR2020-05-12 active