Confidence: Medium · Source: FCC ULS · As of 2026-09-11
KI0JS callsign genealogy
Currently held by SIPPEL II, JACK B
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 KI0JS's current licensee, walking backwards.
- SIPPEL II, JACK BKSgranted 2025-02-07cancelled 2026-03-07
Successor callsigns
Callsigns held now by people who previously held KI0JS.
All historical holders
Every license row we've seen with the callsign KI0JS, oldest first.
- HARRINGTON, WILLIAM R MO2002-01-15 → cancelled 2004-12-28
- SIPPEL II, JACK B KS2026-03-07 → cancelled 2026-03-27