Confidence: Medium · Source: FCC ULS · As of 2026-09-12
KM4XP callsign genealogy
Currently held by Thomas, Roy D
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 KM4XP's current licensee, walking backwards.
- Thomas, Roy DNCgranted 2026-06-18cancelled 2026-07-10
Successor callsigns
Callsigns held now by people who previously held KM4XP.
No current licensee on record previously held this callsign.
All historical holders
Every license row we've seen with the callsign KM4XP, oldest first.
- THOMAS, ROY D NC1989-09-05 → cancelled 2001-09-06
- Thomas, Roy D NC2026-07-10 active