Confidence: Medium · Source: FCC ULS · As of 2026-09-14
N4BX callsign genealogy
Currently held by THOMAS, ROBERT C
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 N4BX's current licensee, walking backwards.
- Hamilton, Mark FFLgranted 2018-03-09cancelled 2018-11-14
Successor callsigns
Callsigns held now by people who previously held N4BX.
- W4VHFactiveROSWELL DX ASSOCIATIONNCgranted 2026-08-13
All historical holders
Every license row we've seen with the callsign N4BX, oldest first.
- THOMAS, ROBERT C NC2006-08-10 → cancelled 2006-10-13
- ROSWELL DX ASSOCIATION NC2006-12-15 → cancelled 2016-10-25
- Hamilton, Mark F FL2018-11-14 active