Confidence: Medium · Source: FCC ULS · As of 2026-09-12
KI0H callsign genealogy
Currently held by Spofford, John
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 KI0H's current licensee, walking backwards.
- Spofford, JohnCOgranted 2021-02-16cancelled 2021-03-09
Successor callsigns
Callsigns held now by people who previously held KI0H.
No current licensee on record previously held this callsign.
All historical holders
Every license row we've seen with the callsign KI0H, oldest first.
- NELSON, CARL E AZ2009-03-04 → cancelled 2021-02-11
- Spofford, John CO2021-03-09 active