Confidence: Medium · Source: FCC ULS · As of 2026-09-14
NP4EI callsign genealogy
Currently held by COUGHLIN, DANIEL T
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 NP4EI's current licensee, walking backwards.
Successor callsigns
Callsigns held now by people who previously held NP4EI.
No current licensee on record previously held this callsign.
All historical holders
Every license row we've seen with the callsign NP4EI, oldest first.
- RODRIGUEZ, JOSE PR2006-02-08 → cancelled 2018-03-23
- COUGHLIN, DANIEL T PR2024-09-14 active