IP2CIDR.com allows you to convert online IP range to CIDR specification. It's useful for Apache web server administrators and give them a possibility to easy manage domain access by using allow and/or deny access direcive. Especially if it requires to put a lot of IP addresses. Each IP range is converted to the minimal list of CIDR blocks.

IP range . . .
. . .

Line prefix none   allow from   deny from

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