Confidence: Medium · Source: FCC ULS · As of 2026-09-12
KO7L callsign genealogy
Currently held by Nielsen, Trevor P
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 KO7L's current licensee, walking backwards.
- Nielsen, Trevor PWAgranted 2018-12-11cancelled 2019-02-02
Successor callsigns
Callsigns held now by people who previously held KO7L.
No current licensee on record previously held this callsign.
All historical holders
Every license row we've seen with the callsign KO7L, oldest first.
- GIBSON, DARREL E ID2006-09-23 → cancelled 2018-12-19
- Nielsen, Trevor P WA2019-02-02 active