Confidence: Medium · Source: FCC ULS · As of 2026-09-14
KI6SJA callsign genealogy
Currently held by Thornburg, William R
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 KI6SJA's current licensee, walking backwards.
- Thornburg, William RCAgranted 2023-10-26cancelled 2023-11-21
Successor callsigns
Callsigns held now by people who previously held KI6SJA.
No current licensee on record previously held this callsign.
All historical holders
Every license row we've seen with the callsign KI6SJA, oldest first.
- THORNBURG, WILLIAM R CA2008-07-28 → cancelled 2020-07-29
- Thornburg, William R CA2023-11-21 active