These are a couple of quick ways to do discover the OS version of your hosts:
A) Use nmap, and run the following command.
nmap --script smb-os-discovery -p 445 10.0.0.0/24
B) Use Metasploit, and run the following commands.
set rhosts 10.0.0.0/24
The output will display the Operating System on each of your hosts.
As a side note, you can use nbtscan for a quick host discovery
nmap -sP -n 10.0.0.1/24