Confidence: Medium · Source: FCC ULS · As of 2026-09-12
ND4J callsign genealogy
Currently held by MATTHEWS, ROBERT M
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 ND4J's current licensee, walking backwards.
Successor callsigns
Callsigns held now by people who previously held ND4J.
No current licensee on record previously held this callsign.
All historical holders
Every license row we've seen with the callsign ND4J, oldest first.
- MATTHEWS, ROBERT M FL1998-08-28 → cancelled 2010-08-31
- SANTOS MELENDEZ, JORGE FL2020-08-25 active