How do I get generate an IP address range given start and end IP address?

Question

How can generate a range of IP addresses from a start and end IP address?

Example for a network \"192.168.0.0/24\":

String start = \"192.168.0.2\"
S         


        

Answer 1

Here's simple implementation that outputs what you asked for:

public static void main(String args[]) {
    String start = "192.168.0.2";
    String end = "192.168.0.254";

    String[] startParts = start.split("(?<=\\.)(?!.*\\.)");
    String[] endParts = end.split("(?<=\\.)(?!.*\\.)");

    int first = Integer.parseInt(startParts[1]);
    int last = Integer.parseInt(endParts[1]);

    for (int i = first; i <= last; i++) {
        System.out.println(startParts[0] + i);
    }
}

Note that this will only work for ranges involving the last part of the IP address.