Confidence: Medium · Source: FCC ULS · As of 2026-09-14
KK4CO callsign genealogy
Currently held by BETZER Mr, GUSTAVO E
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 KK4CO's current licensee, walking backwards.
Successor callsigns
Callsigns held now by people who previously held KK4CO.
No current licensee on record previously held this callsign.
All historical holders
Every license row we've seen with the callsign KK4CO, oldest first.
- GANNON, ALBERT W FL2006-07-21 → cancelled 2018-10-18
- BETZER Mr, GUSTAVO E FL2018-11-09 active