Confidence: Medium · Source: FCC ULS · As of 2026-09-12
KO7O callsign genealogy
Currently held by SEWELL, CHADD
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 KO7O's current licensee, walking backwards.
Successor callsigns
Callsigns held now by people who previously held KO7O.
No current licensee on record previously held this callsign.
All historical holders
Every license row we've seen with the callsign KO7O, oldest first.
- SEWELL, CHADD WA1996-05-15 → cancelled 2008-05-16
- Meier, Thomas WA2018-03-08 active