Confidence: Medium · Source: FCC ULS · As of 2026-09-12
N4ZTH callsign genealogy
Currently held by Hughes, Robert 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 N4ZTH's current licensee, walking backwards.
- Hughes, Robert TNCgranted 2026-08-14cancelled 2026-09-01
Successor callsigns
Callsigns held now by people who previously held N4ZTH.
No current licensee on record previously held this callsign.
All historical holders
Every license row we've seen with the callsign N4ZTH, oldest first.
- WELCH JR, ROBERT D SC1990-07-10 → cancelled 2002-07-11
- Hughes, Robert T NC2026-09-01 active