Confidence: Medium · Source: FCC ULS · As of 2026-09-12
N4SWU callsign genealogy
Currently held by TIMBERLAKE, WILLIAM H
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 N4SWU's current licensee, walking backwards.
- Timberlake, William HTXgranted 2007-06-13cancelled 2007-07-24
Successor callsigns
Callsigns held now by people who previously held N4SWU.
No current licensee on record previously held this callsign.
All historical holders
Every license row we've seen with the callsign N4SWU, oldest first.
- TIMBERLAKE, WILLIAM H AL1988-05-17 → cancelled 2000-05-18
- Timberlake, William H TX2017-05-17 active