Confidence: Medium · Source: FCC ULS · As of 2026-09-12
KF5SXM callsign genealogy
Currently held by Cook, John K
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 KF5SXM's current licensee, walking backwards.
The current licensee has not held any other callsign on record.
Successor callsigns
Callsigns held now by people who previously held KF5SXM.
- Cook III, John KTXgranted 2014-01-25cancelled 2026-03-07