Confidence: Medium · Source: FCC ULS · As of 2026-09-14
KZ8O callsign genealogy
Currently held by GUERNSEY SR, MICHAEL 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 KZ8O's current licensee, walking backwards.
- Osterling, James TFLgranted 2016-05-12cancelled 2018-03-13
Successor callsigns
Callsigns held now by people who previously held KZ8O.
- Dyke, Kenneth CCAgranted 2024-01-03
All historical holders
Every license row we've seen with the callsign KZ8O, oldest first.
- Dyke, Kenneth C CA2003-08-26 → cancelled 2003-11-07
- GUERNSEY SR, MICHAEL E MI2006-02-22 → cancelled 2017-02-14
- osterling, james FL2018-03-13 active