Confidence: Medium · Source: FCC ULS · As of 2026-09-14
KD5CO callsign genealogy
Currently held by OLMSTEAD, CHARLES G
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 KD5CO's current licensee, walking backwards.
- OLMSTEAD, CHARLES GTXgranted 2000-07-01cancelled 2006-10-03
Successor callsigns
Callsigns held now by people who previously held KD5CO.
No current licensee on record previously held this callsign.
All historical holders
Every license row we've seen with the callsign KD5CO, oldest first.
- MARZUKI, EDWARD L GA1998-12-23 → cancelled 2006-07-18
- OLMSTEAD, CHARLES G TX2016-07-12 active