The subnet calculator helps you design networks by taking an IP address and network mask and returning information such as network, broadcast address, and host range.
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Try searching the script for $condt_array. It is used on three lines. On one of the lines it says this:
$mem_connection = $condt_array[0];
You might want to use var_dump() to print out $mem_connection. It looks like the script will use a conditional statement about $mem_connection to decide whether to produce table rows.