> > B C
> > /16 /24 0
> > /17 /25 128
> > /18 /26 192
> > /19 /27 224
> > /20 /28 240
> > /21 /29 248
> > /22 /30 252
> > /23 /31 254
> > /24 /32 255
>
>I don't want to be too nit picky but a 32-bit netmask leaves no bits
>for the host address
the convention is that /32 indicates a single host.
ie, the network address = the host address
>and a 31-bit netmask leaves only the network
>address and broadcast address and no hosts.
and so a /31 is useless. The first "usable" netwmask is a /30, commonly
used for point-to-point links.
Len
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