Confidence: Medium · Source: FCC ULS · As of 2026-09-14
K8CTO callsign genealogy
Currently held by Carlson, Kevin H
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 K8CTO's current licensee, walking backwards.
Successor callsigns
Callsigns held now by people who previously held K8CTO.
- Guilkey, John MOHgranted 2017-12-06
All historical holders
Every license row we've seen with the callsign K8CTO, oldest first.
- Guilkey, John M OH2006-07-18 → cancelled 2008-02-20
- Carlson, Kevin H FL2025-12-23 active