Confidence: Medium · Source: FCC ULS · As of 2026-09-12
NF1B callsign genealogy
Currently held by GUARINO, JAMES J
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 NF1B's current licensee, walking backwards.
- DEBROS, GUY BVTgranted 2011-02-24cancelled 2020-10-02
Successor callsigns
Callsigns held now by people who previously held NF1B.
No current licensee on record previously held this callsign.
All historical holders
Every license row we've seen with the callsign NF1B, oldest first.
- GUARINO, JAMES J DE2016-06-15 → cancelled 2018-09-10
- DEBROS, GUY B VT2020-10-02 active