Confidence: Medium · Source: FCC ULS · As of 2026-09-12
K5IOU callsign genealogy
Currently held by RICHARDS, WILLIAM 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 K5IOU's current licensee, walking backwards.
- Cowart, Leonard JARgranted 2009-08-26cancelled 2009-09-15
Successor callsigns
Callsigns held now by people who previously held K5IOU.
No current licensee on record previously held this callsign.
All historical holders
Every license row we've seen with the callsign K5IOU, oldest first.
- RICHARDS, WILLIAM R TX1995-10-24 → cancelled 2007-10-25
- Cowart, Leonard J AR2019-06-21 active