I want to block this IP range in the SMTP access control 66.117.0.0 - 66.117.31.255
Can someone tell me the proper subnet mask to use ?
Per http://www.dnsstuff.com/tools/cidr.ch?ip=66.117.0.0 , that corresponds to a CIDR range of 66.117.0.0/19.
Per http://www.dnsstuff.com/tools/cidr.ch?ip=66.117.0.0%2F19 , you want to use a subnet mask of 255.255.224.0.
-Scott
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