Confidence: Medium · Source: FCC ULS · As of 2026-09-12
K0ILO callsign genealogy
Currently held by Guthals, Douglas W
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 K0ILO's current licensee, walking backwards.
- Guthals, Douglas WCOgranted 2021-03-01cancelled 2021-09-11
Successor callsigns
Callsigns held now by people who previously held K0ILO.
No current licensee on record previously held this callsign.