Confidence: Medium · Source: FCC ULS · As of 2026-09-12
KC9CK callsign genealogy
Currently held by MC WILLIAMS, JOHN A
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 KC9CK's current licensee, walking backwards.
- MC WILLIAMS, JOHN Acancelled 1999-04-09
Successor callsigns
Callsigns held now by people who previously held KC9CK.
No current licensee on record previously held this callsign.