Confidence: Medium · Source: FCC ULS · As of 2026-09-12
KN4W callsign genealogy
Currently held by SIMPSON, WILLIAM W
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 KN4W's current licensee, walking backwards.
Successor callsigns
Callsigns held now by people who previously held KN4W.
No current licensee on record previously held this callsign.
All historical holders
Every license row we've seen with the callsign KN4W, oldest first.
- SIMPSON, WILLIAM W NC2004-04-21 → cancelled 2016-07-12
- Gelb, Margaret R FL2016-07-29 active