Confidence: Medium · Source: FCC ULS · As of 2026-09-14
KE4KSI callsign genealogy
Currently held by COOK JR, FRANK T
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 KE4KSI's current licensee, walking backwards.
- COOK JR, FRANK TNCgranted 2016-10-11cancelled 2016-11-01
Successor callsigns
Callsigns held now by people who previously held KE4KSI.
No current licensee on record previously held this callsign.
All historical holders
Every license row we've seen with the callsign KE4KSI, oldest first.
- COOK JR, FRANK T NC1994-03-29 → cancelled 2006-03-30
- COOK JR, FRANK T NC2016-11-01 active