Confidence: Medium · Source: FCC ULS · As of 2026-09-14
K5CCO callsign genealogy
Currently held by Cooksey, Christopher C
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 K5CCO's current licensee, walking backwards.
- Cooksey, Christopher CTXgranted 2020-02-10cancelled 2020-03-13
Successor callsigns
Callsigns held now by people who previously held K5CCO.
- Pham, Thien TTXgranted 2017-04-14
All historical holders
Every license row we've seen with the callsign K5CCO, oldest first.
- GIERHART, WILLIAM R OK1997-01-28 → cancelled 2009-01-29
- Pham, Thien T TX2016-06-24 → cancelled 2017-04-14
- Cooksey, Christopher C TX2020-03-13 active