Confidence: Medium · Source: FCC ULS · As of 2026-09-12
NU4R callsign genealogy
Currently held by PORTERFIELD, ROBERT N
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 NU4R's current licensee, walking backwards.
Successor callsigns
Callsigns held now by people who previously held NU4R.
No current licensee on record previously held this callsign.
All historical holders
Every license row we've seen with the callsign NU4R, oldest first.
- PORTERFIELD, ROBERT N VA1996-06-12 → cancelled 2001-12-10
- MARINO, GREGORY R FL2023-12-07 active