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Message: <blockquote data-quote="Radical78" data-source="post: 16244457" data-attributes="member: 272036">11111111.11111111.11111111.11100000 = 255.255.255.224  The five 0's at the end can support up to 32 unique addresses which is enough for your maximum of 25 computers.  Remember that you're working with binary, so...  11111111 = 128 + 64 + 32 + 16 + 8 + 4 + 2 + 1 = 255 11100000 = 128 + 64 + 32 = 224  ---------------------------------------...  Here is another example to hopefully make some of this more clear:  11111111.11111111.11111111.11111100 = 255.255.255.252  This subnet mask  would only allow four computers on the network to obtain an address.   That's because the address space is defined by the trailing 0's.  Since  there are only two zeros the only possible unique addresses would be  00 01 10 11  The leading thirty 1's define the network itself and cannot be used to identify individual computers.</blockquote>

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