Confidence: Medium · Source: FCC ULS · As of 2026-09-12
N4ZDI callsign genealogy
Currently held by Watson, Marshall L
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 N4ZDI's current licensee, walking backwards.
Successor callsigns
Callsigns held now by people who previously held N4ZDI.
No current licensee on record previously held this callsign.
All historical holders
Every license row we've seen with the callsign N4ZDI, oldest first.
- FABELO, OSVALDO FL1990-05-29 → cancelled 2002-05-30
- Watson, Marshall L AL2022-08-04 active