Local Security Groups on Server 2008 R2 DC

Hello,

I have a Windows Server 2008 R2 which is a Domain Controller, I need to add a domain user to a local security group. I know how to add a domain user to a local security group on a DC, net localgroup {Group Name} /add {domain}\{user}, however I do not know the exact name of the local security group, it was created by a software I installed on a server. Is there a command I can run that can show me the names of all the local security groups on the DC?

Thank you,

Sergey