Confidence: Medium · Source: FCC ULS · As of 2026-09-14
KO4DR callsign genealogy
Currently held by BIRDSALL, ARTHUR L
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 KO4DR's current licensee, walking backwards.
Successor callsigns
Callsigns held now by people who previously held KO4DR.
- Fleming, James KNCgranted 2026-04-10
All historical holders
Every license row we've seen with the callsign KO4DR, oldest first.
- BIRDSALL, ARTHUR L FL2002-11-21 → cancelled 2014-05-06
- Fleming, James K NC2023-12-05 → cancelled 2026-04-10