Confidence: Medium · Source: FCC ULS · As of 2026-09-12
K4SYS callsign genealogy
Currently held by SHERROUSE SR, CHARLES M
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 K4SYS's current licensee, walking backwards.
- Cordero, RichardNCgranted 2026-07-28cancelled 2026-08-21
Successor callsigns
Callsigns held now by people who previously held K4SYS.
No current licensee on record previously held this callsign.
All historical holders
Every license row we've seen with the callsign K4SYS, oldest first.
- SHERROUSE SR, CHARLES M FL2003-08-29 → cancelled 2015-09-01
- Cordero, Richard NC2026-08-21 active