Confidence: Medium · Source: FCC ULS · As of 2026-09-12
KD7OA callsign genealogy
Currently held by PRESTON, CHARLES M
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 KD7OA's current licensee, walking backwards.
- PRESTON, CHARLES MIDgranted 2007-09-05cancelled 2015-09-29
Successor callsigns
Callsigns held now by people who previously held KD7OA.
- PRESTON, CHARLES MIDgranted 2025-09-30
All historical holders
Every license row we've seen with the callsign KD7OA, oldest first.
- WILCOX, WILLIAM L OR1988-08-09 → cancelled 2000-08-10
- PRESTON, CHARLES M ID2015-09-29 → cancelled 2015-12-15