Confidence: Medium · Source: FCC ULS · As of 2026-09-12
NN1S callsign genealogy
Currently held by Ennis, Donald K
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 NN1S's current licensee, walking backwards.
- Ennis, Donald KWIgranted 2009-07-17cancelled 2009-09-15
Successor callsigns
Callsigns held now by people who previously held NN1S.
No current licensee on record previously held this callsign.
All historical holders
Every license row we've seen with the callsign NN1S, oldest first.
- ZIEMSKI, THOMAS S CT1997-07-24 → cancelled 2009-07-25
- Ennis, Donald K WI2020-01-04 active