Check whether the ipAddress is in private range

Question

How would I check to see whether the ip address is in private category ?

    if(isPrivateIPAddress(ipAddress)) {
                


        

Answer 1

This is a quick hack I generated to test my own address.

import java.net.InetAddress;
import java.net.UnknownHostException;

public class LocalAddress {

    public static void main(String[] args) {
        InetAddress address = null;
        try {
            address = InetAddress.getLocalHost();
        } catch (UnknownHostException e) {
             e.printStackTrace();
        }
        if (address.isSiteLocalAddress()) {
            System.out.println("Site Local Address: " + address.getHostAddress());
        } else {
            System.out.println("Routeable Address: " + address.getHostAddress());
        }
    }

}

EDIT: This code has not been tested for the link local addresses, localhost, or address blocks reserved for documentation. The first two cases have methods that return them. The last is not referenced in the documentation of the class.