Just run the following command:
net rpc SHUTDOWN -C "enter a comment to display at shutdown" -f -I x.x.x.x -U username%password
where x.x.x.x is the ip address.
To know what machines are on in a particular subnet just nmap it, like this:
nmap -sP 192.168.5.0/24 | cut -d " " -f2 > lixo.txt
And with the lixo.txt you can cicle the computers and shut them down, just run this:
for i in $(cat lixo.txt);do net rpc SHUTDOWN -f -I $i -U user%password; done
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