To find the motherboard model number on Windows (10), run cmd, and type:

C:\Users\kenno>wmic baseboard get product,Manufacturer,version,serialnumber
Manufacturer                   Product         SerialNumber            Version
Gigabyte Technology Co., Ltd.  Z170N-Gaming 5  To be filled by O.E.M.  x.x

Ref & credit: How to Find Computer and Motherboard Model Serial Number on Windows 10