Confidence: Medium · Source: FCC ULS · As of 2026-09-14
KD9SK callsign genealogy
Currently held by Knight, William S
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 KD9SK's current licensee, walking backwards.
- Knight, William SILgranted 2011-01-20cancelled 2014-04-22
- KA9YMYno FCC ULS record on file
Successor callsigns
Callsigns held now by people who previously held KD9SK.
No current licensee on record previously held this callsign.
All historical holders
Every license row we've seen with the callsign KD9SK, oldest first.
- JUDAY, RONALD A IN1995-04-12 → cancelled 2007-04-13
- Knight, William S AR2024-01-30 active