Java Utililty Methods IP Address Get

List of utility methods to do IP Address Get

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Description

The list of methods to do IP Address Get are organized into topic(s).

Method

SetgetAllLocalIpv4Addresses()
Get IP addresses for all interfaces on this machine that are IPv4. 
Set<InetAddress> ret = new HashSet<>();
Enumeration<NetworkInterface> interfaces = NetworkInterface.getNetworkInterfaces();
while (interfaces.hasMoreElements()) {
    NetworkInterface networkInterface = interfaces.nextElement();
    Enumeration<InetAddress> addrs = networkInterface.getInetAddresses();
    while (addrs.hasMoreElements()) { 
        InetAddress addr = addrs.nextElement();
        if (addr instanceof Inet4Address && !addr.isAnyLocalAddress()) {
...
SetgetAllMyHostIPV4Adresses()
get All My Host IPV Adresses 
Set<InetAddress> addresses = new HashSet<InetAddress>();
Enumeration<NetworkInterface> en = NetworkInterface.getNetworkInterfaces();
while (en.hasMoreElements()) {
    Enumeration<InetAddress> ias = en.nextElement().getInetAddresses();
    while (ias.hasMoreElements()) {
        InetAddress address = ias.nextElement();
        if (isIPv4(stripToSlash(address.toString())))
            addresses.add(address);
...
ListgetAllUsableIPAddresses()
Returns a list of IP addresses that can be used to communicate with a peer on a different machine. 
List<String> output = new ArrayList<String>();
try {
    for (NetworkInterface ni : Collections.list(NetworkInterface.getNetworkInterfaces())) {
        for (InterfaceAddress address : ni.getInterfaceAddresses()) {
            if (!address.getAddress().isMulticastAddress() && !address.getAddress().isLinkLocalAddress()
                    && !address.getAddress().isLoopbackAddress()) {
                output.add(address.getAddress().getHostAddress() + "/" + address.getNetworkPrefixLength());
} catch (SocketException e) {
return output;
StringgetExternalIP()
get External IP 
try {
    URL myIp = new URL("http://checkip.dyndns.org/");
    BufferedReader in = new BufferedReader(new InputStreamReader(myIp.openStream()));
    String s = in.readLine();
    return s.substring(s.lastIndexOf(":") + 2, s.lastIndexOf("</body>"));
} catch (Exception ex) {
    return "error " + ex;
InetAddressgetExternalIp()
get External Ip 
List<InetAddress> localInetAddresses = getLocalInetAddresses();
Pattern pattern = Pattern.compile(EXTERNAL_IP_REGEX);
for (InetAddress localInetAddress : localInetAddresses) {
    String hostAddress = localInetAddress.getHostAddress();
    if (!hostAddress.startsWith("127.") && pattern.matcher(hostAddress).matches()) {
        return localInetAddress;
return null;
StringgetExternalIp()
get External Ip 
BufferedReader in = null;
try {
    URL whatismyip = new URL("http://checkip.amazonaws.com");
    in = new BufferedReader(new InputStreamReader(whatismyip.openStream()));
    String ip = in.readLine();
    return ip;
} catch (Exception exc) {
    System.out.println("Exception getting external IP: " + exc.getMessage());
...
StringgetExternalIp()
Fetches the external ip through amazonaw's utility. 
try {
    URL url = new URL("http://checkip.amazonaws.com/");
    BufferedReader in = new BufferedReader(new InputStreamReader(url.openStream()));
    return in.readLine();
} catch (MalformedURLException e) {
    return null;
} catch (IOException e) {
    return null;
...
StringgetExternalIP(String host, String regexPattern)
Finds external IP address by sending http request to host with expected response in pattern regexPattern 
String resp = null;
if (regexPattern == null)
    regexPattern = ".+<body>Current IP Address: (\\d+.\\d+.\\d+.\\d+)</body>.+";
if (host == null)
    host = "http://checkip.dyndns.org:8245/";
Pattern pattern = Pattern.compile(regexPattern);
try {
    java.net.URL URL = new java.net.URL(host);
...
StringgetExternalIPAddress()
Returns external IP address by sending HTTP request to http://whatismyip.com/automation/n09230945.asp 
String url = null;
try {
    java.net.URL URL = new java.net.URL("http://whatismyip.com/automation/n09230945.asp");
    java.net.HttpURLConnection conn = (HttpURLConnection) URL.openConnection();
    conn.setConnectTimeout(60000);
    conn.setReadTimeout(60000);
    java.io.InputStream InStream = conn.getInputStream();
    java.io.InputStreamReader Isr = new java.io.InputStreamReader(InStream);
...
StringgetExternalIPAddress()
get External IP Address 
BufferedReader in = null;
try {
    URL whatismyip = new URL("http://checkip.amazonaws.com");
    URLConnection connection = whatismyip.openConnection();
    connection.addRequestProperty("Protocol", "Http/1.1");
    connection.addRequestProperty("Connection", "keep-alive");
    connection.addRequestProperty("Keep-Alive", "1000");
    connection.addRequestProperty("User-Agent", "Web-Agent");
...