Confidence: Medium · Source: FCC ULS · As of 2026-09-14
KC4RAJ callsign genealogy
Currently held by UNDERWOOD, FREDRIC C
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 KC4RAJ'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 KC4RAJ.
- UNDERWOOD, FREDRIC CALgranted 2012-05-22cancelled 2015-06-23