At work there are some unused ip addresses but we dont know which ones
they are (because there are alot of computers) is there a port which could
be used to ping the subnet over a few days to work out which ip addresses
are actually coming online? Thanks
Running 'arp -a' on your router or some central machine like a fileserver will give you a good starting point. Another poster suggested running an nmap ping scan, which will certainly work as well.
You might also look at your DHCP server's leases...
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