85 won't work.
If you make your network 192.168.1.80 and your netmask 255.255.255.248
your broadcast address will be 192.168.1.87 and your usable addresses
will be 81 - 86.
As for why, try looking at these numbers in binary.
> Afternoon:
>
> I'm trying to understand how netmasks work. We want to set up a small
> pool of IP Addresses, and the only thing we can do is specify the network
> and the netmask. They want the pool to start at 192.168.1.85, and have 5
> usuable IP Addresses. What do I specify for the netmask, and more
> importantly, why? I understand about setting up a network range, when the
> network is specified at 0, but this 80 is throwing off my thinking.
>
> Anyone help?
>
> - Mike
>
>
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