Confidence: Medium · Source: FCC ULS · As of 2026-09-14
KX4OJ callsign genealogy
Currently held by Butler, Nicholas R
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 KX4OJ's current licensee, walking backwards.
- Butler, Nicholas RTNgranted 2018-11-06cancelled 2018-11-19
Successor callsigns
Callsigns held now by people who previously held KX4OJ.
No current licensee on record previously held this callsign.