Confidence: Medium · Source: FCC ULS · As of 2026-09-12
K4USX callsign genealogy
Currently held by Humelsine, Mary 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 K4USX's current licensee, walking backwards.
- Humelsine, Mary WFLgranted 2007-03-27cancelled 2007-04-20
Successor callsigns
Callsigns held now by people who previously held K4USX.
No current licensee on record previously held this callsign.