Confidence: Medium · Source: FCC ULS · As of 2026-09-14
W9SJK callsign genealogy
Currently held by KOCH, STEPHEN J
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 W9SJK's current licensee, walking backwards.
- KOCH, STEPHEN JILgranted 1996-08-14cancelled 1999-11-16
Successor callsigns
Callsigns held now by people who previously held W9SJK.
No current licensee on record previously held this callsign.