Blocking IP Address Ranges in CIDR
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...if you wanted to block all IP Addresses except the private ones in the 192.168.X.Y range using CIDR, here is how:

IP Address Ranges; -    (reserved) -

            (the next number which is the first private IP Address #)                (the last number in the private IP Address range) - -    (reserved)

Same as above, but expressed in CIDR;


...and if you really need it: