Confidence: Medium · Source: FCC ULS · As of 2026-09-14
NK9O callsign genealogy
Currently held by LAUSEVICH, ARNOLD J
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 NK9O's current licensee, walking backwards.
- Greusel, John FILgranted 2018-07-11cancelled 2026-07-24
Successor callsigns
Callsigns held now by people who previously held NK9O.
No current licensee on record previously held this callsign.
All historical holders
Every license row we've seen with the callsign NK9O, oldest first.
- LAUSEVICH, ARNOLD J WI2013-11-25 → cancelled 2026-03-06
- Greusel, John F IL2026-07-24 active