You want to find out whether your server or computer is joined or not to a domain. You may refer to the below methods,
Using command prompt
#Command
systeminfo | findstr /i "domain"
#Possible Output
Domain: WORKGROUP (You are not in the domain)
Domain: ITSITI.COM (Yes, you are in the domain)
Using My Computer Information
You can right-click on My Computer and choose the Properties. Look for the domain.
