Confidence: Medium · Source: FCC ULS · As of 2026-09-12
K4USN callsign genealogy
Currently held by BROWN, JAMES 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 K4USN's current licensee, walking backwards.
- Brown, James DTNgranted 2000-04-01cancelled 2000-05-19
Successor callsigns
Callsigns held now by people who previously held K4USN.
No current licensee on record previously held this callsign.
All historical holders
Every license row we've seen with the callsign K4USN, oldest first.
- NAVY MARINE CORPS MARS REGION TWO SC1987-11-17 → cancelled 1999-11-18
- BROWN, JAMES D TX2020-06-23 active