Confidence: Medium · Source: FCC ULS · As of 2026-09-12
N4ZDC callsign genealogy
Currently held by GLADDEN, THOMAS R
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 N4ZDC's current licensee, walking backwards.
- Smith, Nancy AFLgranted 2003-03-19cancelled 2004-02-07
Successor callsigns
Callsigns held now by people who previously held N4ZDC.
No current licensee on record previously held this callsign.
All historical holders
Every license row we've seen with the callsign N4ZDC, oldest first.
- GLADDEN, THOMAS R NC1990-05-29 → cancelled 2002-05-30
- Smith, Nancy A FL2024-01-13 active