I believe the syntax you will need to use is 41.210.63.255/18. This will block 41.210.0.0 through 41.210.63.255 for a total of 16384 IPs.
Yahoo uses CIDR for range blocking. I used this site to get the proper syntax: IP Address Guide | Ping | Traceroute | DNS Lookup | CIDR | Geolocation | HTML Validator. DNS Stuff is sometimes more accurate and easier to use then Yahoo's reverse DNS which is why I recommended them.
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Jeffrey M.
Solid Cactus - Senior Project Manager
Last edited by cactus_jeffreym; 03-28-2008 at 05:00 PM.
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