Confidence: Medium · Source: FCC ULS · As of 2026-09-14
KC9ULU callsign genealogy
Currently held by Mason, Keith L
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 KC9ULU's current licensee, walking backwards.
- Mason, Keith LILgranted 2009-03-26cancelled 2011-07-12
Successor callsigns
Callsigns held now by people who previously held KC9ULU.
No current licensee on record previously held this callsign.