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Subnet mask of an ip range!

1K views 2 replies 2 participants last post by  UnD3R0aTh 
#1 ·
..how can i find the subnet mask of a website so i can block ip ranges in my router firewall? can i calculate that from only one ip?
 
#2 ·
You cant determine that from only 1 address

You would probably have to do a traceroute to the offending IP, and then start the same process to each IP above, until your 2nd to last hop changes IP (meaning different router), then repeat the process to each IP below until a different 2nd to last hop is reached.

Of course that assumes that their network doesn't block ICMP, and also assumes every (or most) IP on that range are up.
 
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