Confidence: Medium · Source: FCC ULS · As of 2026-09-14
KR0I 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 KR0I's current licensee, walking backwards.
Successor callsigns
Callsigns held now by people who previously held KR0I.
No current licensee on record previously held this callsign.
All historical holders
Every license row we've seen with the callsign KR0I, oldest first.
- Mac Donald, Edward C MO2013-07-30 → cancelled 2026-03-06
- SIPPEL II, JACK B KS2026-03-27 active