Confidence: Medium · Source: FCC ULS · As of 2026-09-14
KI4SX callsign genealogy
Currently held by COOK, JERRY 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 KI4SX's current licensee, walking backwards.
Successor callsigns
Callsigns held now by people who previously held KI4SX.
- COOK, JERRY WALgranted 2010-02-27cancelled 2016-03-01
All historical holders
Every license row we've seen with the callsign KI4SX, oldest first.
- COOK, JERRY W AL2009-02-18 → cancelled 2010-02-27
- COOK, JERRY W AL2026-02-11 active