Confidence: Medium · Source: FCC ULS · As of 2026-09-14
KG4GYO callsign genealogy
Currently held by GUENTHER, COLENE 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 KG4GYO's current licensee, walking backwards.
- GUENTHER, COLENE RFLgranted 2013-01-11cancelled 2014-07-08
Successor callsigns
Callsigns held now by people who previously held KG4GYO.
- IRIZARRY, HARVEY CPRgranted 2022-04-29
All historical holders
Every license row we've seen with the callsign KG4GYO, oldest first.
- IRIZARRY, HARVEY C PR2010-02-18 → cancelled 2012-05-15
- GUENTHER, COLENE R PR2024-10-22 active