Confidence: Medium · Source: FCC ULS · As of 2026-09-12
N4SDK callsign genealogy
Currently held by KOSMETATOS, S DENNIS
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 N4SDK's current licensee, walking backwards.
Successor callsigns
Callsigns held now by people who previously held N4SDK.
No current licensee on record previously held this callsign.
All historical holders
Every license row we've seen with the callsign N4SDK, oldest first.
- GLEBUS, ROBERT M NC1988-02-23 → cancelled 2000-02-24
- KOSMETATOS, S DENNIS GA2021-04-16 active