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  1. or download this
    my @octets=split(/\./,$ip_address);
my $numerical_address=($octets[3]+(255*$octets[2])+(65535*$octets[1])+
+(16777216*$octets[0]));
  2. or download this
    SELECT count(*) from table WHERE (int(ip/256)*256) = (int($ip_address_
+to_be_compared_to/256)*256)