Confidence: Medium · Source: FCC ULS · As of 2026-09-14
NK0O callsign genealogy
Currently held by KNOLL, CHESTER 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 NK0O's current licensee, walking backwards.
Successor callsigns
Callsigns held now by people who previously held NK0O.
No current licensee on record previously held this callsign.
All historical holders
Every license row we've seen with the callsign NK0O, oldest first.
- KNOLL, CHESTER E CO1995-01-31 → cancelled 2007-02-01
- KAHMANN, DANIEL P MO2025-06-24 active