CODEWITHSUNDEEP
c#javanetwork-programmingnetwork-protocols
Mudasir Bhutto
Mudasir Bhutto

Reputation: 468

Difference between Internal IP Address and External IP Address

Can anyone tell me what is difference between Internal IP Address and External IP Address? How to get both in any programming language like Java, C# or Adobe AIR?

Upvotes: 0

Views: 2800

Answers (2)

MByD
MByD

Reputation: 137312

You can use the following code (in java) to get the local IP address:

public String getLocalIpAddress() {
     try {
         for (Enumeration en = NetworkInterface.getNetworkInterfaces(); en.hasMoreElements();) {
             NetworkInterface ni = en.nextElement();
             for (Enumeration enumIpAddr = ni.getInetAddresses(); enumIpAddr.hasMoreElements();) {
                 InetAddress inetAddress = enumIpAddr.nextElement();
                 if (!inetAddress.isLoopbackAddress()) { //ignore 127.0.0.1
                     return inetAddress.getHostAddress().toString();
                 }
             }
         }
     } catch (SocketException ex) {
     }
     return null;
 }

Upvotes: 1

SQLMason
SQLMason

Reputation: 3275

Internal IP address is the address from your network:

IPHostEntry heserver = Dns.GetHostEntry(Dns.GetHostName());
IPAddress curAdd = heserver.AddressList[0];
curAdd.ToString();

Your external IP address is the address from your ISP

string ip = new 
     System.Net.WebClient()
      .DownloadString(("http://www.whatismyip.com/automation/n09230945.asp"));

Upvotes: 1

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