Confidence: Medium · Source: FCC ULS · As of 2026-09-12
K4OG callsign genealogy
Currently held by Hayden, Mark V
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 K4OG's current licensee, walking backwards.
- Hayden, Mark VKYgranted 2023-11-07cancelled 2024-07-26
Successor callsigns
Callsigns held now by people who previously held K4OG.
No current licensee on record previously held this callsign.
All historical holders
Every license row we've seen with the callsign K4OG, oldest first.
- CAMPBELL, GEORGE C WI2016-12-07 → cancelled 2022-07-07
- Hayden, Mark V KY2024-07-26 active