Confidence: Medium · Source: FCC ULS · As of 2026-09-12
N9OSH callsign genealogy
Currently held by Piechowski, Paul W
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 N9OSH's current licensee, walking backwards.
- Piechowski, Paul WWIgranted 2024-10-25cancelled 2025-02-22
Successor callsigns
Callsigns held now by people who previously held N9OSH.
No current licensee on record previously held this callsign.
All historical holders
Every license row we've seen with the callsign N9OSH, oldest first.
- KILIAN, PETER H WI1992-03-31 → cancelled 2004-04-01
- Piechowski, Paul W WI2025-02-22 active