Confidence: Medium · Source: FCC ULS · As of 2026-09-12
K4XTC callsign genealogy
Currently held by Sunderman Jr, Claude 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 K4XTC's current licensee, walking backwards.
- Sunderman Jr, Claude JFLgranted 2002-02-01cancelled 2002-11-02
Successor callsigns
Callsigns held now by people who previously held K4XTC.
No current licensee on record previously held this callsign.