address/mask for subnet

[David Taylor]

Hi,

I have to setup an ipfwadm rule for a subnet.  The IP addresses are in
the range 129.8.111.192 - 129.8.111.198.  The rule must apply to those
IPs, but no others.  I have absolutely no idea whatsoever as to how to
calculate the mask.  Can someone out there *please* help me?  I don't
just want the answer; I want to know how to calculate this myself in
future.

Thanks in advance.

-- 
David


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