Confidence: Medium · Source: FCC ULS · As of 2026-09-12
KD4RGB callsign genealogy
Currently held by PATTERSON, WILLIAM 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 KD4RGB's current licensee, walking backwards.
- PATTERSON, WILLIAM CNCgranted 2025-07-08cancelled 2025-07-26
Successor callsigns
Callsigns held now by people who previously held KD4RGB.
No current licensee on record previously held this callsign.
All historical holders
Every license row we've seen with the callsign KD4RGB, oldest first.
- PATTERSON, WILLIAM C NC2012-05-01 → cancelled 2024-07-23
- PATTERSON, WILLIAM C NC2025-07-26 active