[nycbug-talk] CIDR Network Subtraction Tool?

Tim A. techneck at goldenpath.org
Tue Jun 16 14:28:45 EDT 2009

spamd blacklisting from foreign.txt source file with a list of all 
non-US IP space.
Occasionally we spark up a new non-US vendor relationship and need to 
receive email from their email servers but their IP addresses have been 
blacklisted in foreign.txt
Subtract their IPs / ISPs netblock from the /8 entry.
Currently, I do this by hand. Googling for network calculators spits 
back a ton of tools that calculate subnets but none of which do this 
sort of network subtraction.
If anyone is aware of such a tool, please share.

       89 .  0 .  0 .  0   /8
-      89 .208 .106 .  0   /24

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