Confidence: Medium · Source: FCC ULS · As of 2026-09-12
K4SJC callsign genealogy
Currently held by CLAYTON, STEVEN J
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 K4SJC's current licensee, walking backwards.
- CLAYTON, STEVEN JFLgranted 2013-11-18cancelled 2015-12-08
Successor callsigns
Callsigns held now by people who previously held K4SJC.
No current licensee on record previously held this callsign.
All historical holders
Every license row we've seen with the callsign K4SJC, oldest first.
- GRINER, CLAUDE L FL2003-03-01 → cancelled 2015-04-21
- CLAYTON, STEVEN J FL2025-09-27 active