Confidence: Medium · Source: FCC ULS · As of 2026-09-14
N4OZK callsign genealogy
Currently held by N4OZK AMATEUR RADIO GROUP
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 N4OZK's current licensee, walking backwards.
- MILLER, MICHAEL OALgranted 2022-01-11cancelled 2024-03-01
Successor callsigns
Callsigns held now by people who previously held N4OZK.
- Spainhour, Stephen EVAgranted 2017-05-01cancelled 2017-12-22
All historical holders
Every license row we've seen with the callsign N4OZK, oldest first.
- N4OZK AMATEUR RADIO GROUP AL2006-07-18 → cancelled 2018-07-19
- MILLER, MICHAEL O AL2024-03-01 active