How to Get the Ip Address of the Server on Which My C# Application Is Running On

Get Server Machine IP

try this:

string hostName = System.Net.Dns.GetHostName();
string ipAddress = System.Net.Dns.GetHostEntry(hostName).AddressList[index].ToString();

index is the index of network connection at your server.

How to get the server IP Address (in C# / asp.net)?

Request.ServerVariables["LOCAL_ADDR"];

From the docs:

Returns the server address on which the request came in. This is important on computers where there can be multiple IP addresses bound to the computer, and you want to find out which address the request used.

This is distinct from the Remote addresses which relate to the client machine.

Getting the IP address of server in ASP.NET?

This should work:

 //this gets the ip address of the server pc

  public string GetIPAddress()
  {
     IPHostEntry ipHostInfo = Dns.GetHostEntry(Dns.GetHostName()); // `Dns.Resolve()` method is deprecated.
     IPAddress ipAddress = ipHostInfo.AddressList[0];

     return ipAddress.ToString();
  }

http://wec-library.blogspot.com/2008/03/gets-ip-address-of-server-pc-using-c.html

OR

 //while this gets the ip address of the visitor making the call
  HttpContext.Current.Request.UserHostAddress;

http://www.geekpedia.com/KB32_How-do-I-get-the-visitors-IP-address.html

Get local IP address

To get local Ip Address:

public static string GetLocalIPAddress()
{
    var host = Dns.GetHostEntry(Dns.GetHostName());
    foreach (var ip in host.AddressList)
    {
        if (ip.AddressFamily == AddressFamily.InterNetwork)
        {
            return ip.ToString();
        }
    }
    throw new Exception("No network adapters with an IPv4 address in the system!");
}

To check if you're connected or not:

System.Net.NetworkInformation.NetworkInterface.GetIsNetworkAvailable();

How to get IP addresses of hosts on local network running my program

As mentioned in comments, you need some kind of peer-discovery protocol.

As many multimedia devices, routers etc. use multicast based discovery protocols like SSDP, I created a similar discovery service sample .

Usage is simple. Just use

Discoverer.PeerJoined = ip => Console.WriteLine("JOINED:" + ip);
Discoverer.PeerLeft= ip => Console.WriteLine("LEFT:" + ip);

Discoverer.Start();

All your clients will use the same code.

---

using System;
using System.Net;
using System.Net.Sockets;
using System.Runtime.Caching; // add this library from the reference tab
using System.Text;
using System.Threading.Tasks;

namespace SO
{
    public class Discoverer
    {
        static string MULTICAST_IP = "238.212.223.50"; //Random between 224.X.X.X - 239.X.X.X
        static int MULTICAST_PORT = 2015;    //Random

        static UdpClient _UdpClient;
        static MemoryCache _Peers = new MemoryCache("_PEERS_");

        public static Action<string> PeerJoined = null;
        public static Action<string> PeerLeft = null;

        public static void Start()
        {
            _UdpClient = new UdpClient();
            _UdpClient.Client.Bind(new IPEndPoint(IPAddress.Any, MULTICAST_PORT));
            _UdpClient.JoinMulticastGroup(IPAddress.Parse(MULTICAST_IP));


            Task.Run(() => Receiver());
            Task.Run(() => Sender());
        }

        static void Sender()
        {
            var IamHere = Encoding.UTF8.GetBytes("I AM ALIVE");
            IPEndPoint mcastEndPoint = new IPEndPoint(IPAddress.Parse(MULTICAST_IP), MULTICAST_PORT);

            while (true)
            {
                _UdpClient.Send(IamHere, IamHere.Length, mcastEndPoint);
                Task.Delay(1000).Wait();
            }
        }

        static void Receiver()
        {
            var from = new IPEndPoint(0, 0);
            while (true)
            {
                _UdpClient.Receive(ref from);
                if (_Peers.Add(new CacheItem(from.Address.ToString(), from),
                               new CacheItemPolicy() { 
                                    SlidingExpiration = TimeSpan.FromSeconds(20),
                                    RemovedCallback = (x) => { if (PeerLeft != null) PeerLeft(x.CacheItem.Key); }
                               }
                             )
                )
                {
                    if (PeerJoined != null) PeerJoined(from.Address.ToString());
                }

                Console.WriteLine(from.Address.ToString());
            }
        }
    }
}

Now a little bit about the algorithm:

• Every client multicasts a packet every seconds.

• if the receiver(every client has it) gets a packet from an IP that isn't in its cache, it will fire PeerJoined method.

• Cache will expire in 20 seconds. If a client doesn't receive a packet within that duration from another client in cache, it will fire PeerLeft method.

How do you get the IP address of a server (not a webserver) but a TCP server created on a wifi module in Xamarin.Forms

How to Read IP Address in XAMARIN Form, i have Created the DependencyServices in both IOS and Android projects and getting a proper IP address. Below is code to get IP address.

In PCL Project

public interface IIPAddressManager
    {
        String GetIPAddress();
    }

In IOS Project

[assembly: Dependency(typeof(YourAppNamespace.iOSUnified.iOS.DependencyServices.IPAddressManager))]

namespace YourAppNamespace.iOSUnified.iOS.DependencyServices
{
    class IPAddressManager : IIPAddressManager
    {
        public string GetIPAddress()
        {
            String ipAddress = "";

            foreach (var netInterface in NetworkInterface.GetAllNetworkInterfaces())
            {
                if (netInterface.NetworkInterfaceType == NetworkInterfaceType.Wireless80211 ||
                    netInterface.NetworkInterfaceType == NetworkInterfaceType.Ethernet)
                {
                    foreach (var addrInfo in netInterface.GetIPProperties().UnicastAddresses)
                    {
                        if (addrInfo.Address.AddressFamily == AddressFamily.InterNetwork)
                        {
                            ipAddress = addrInfo.Address.ToString();

                        }
                    }
                }
            }

            return ipAddress;
        }
    }
}

In Android Project.

[assembly: Dependency(typeof(YourAppNamespace.Android.Android.DependencyServices.IPAddressManager))]

namespace YourAppNamespace.Android.Android.DependencyServices
{
    class IPAddressManager : IIPAddressManager
    {
        public string GetIPAddress()
        {
            IPAddress[] adresses = Dns.GetHostAddresses(Dns.GetHostName());

            if (adresses !=null && adresses[0] != null)
            {
                return adresses[0].ToString();
            }
            else
            {
                return null;
            }
        }
    }
}

Then call a DependencyServices in UI project.

string ipaddress = DependencyService.Get<IIPAddressManager>().GetIPAddress

How to get the IP address of a machine in C#

IPAddress[] localIPs = Dns.GetHostAddresses(Dns.GetHostName());

Your machine doesn't have a single IP address, and some of the returned addresses can be IPv6.

MSDN links:

• Dns.GetHostAddresses
• IPAddress

Alternatively, as MSalters mentioned, 127.0.0.1 / ::1 is the loopback address and will always refer to the local machine. For obvious reasons, however, it cannot be used to connect to the local machine from a remote machine.

Get All IP Addresses on Machine

I think this example should help you.

// Get host name
String strHostName = Dns.GetHostName();

// Find host by name
IPHostEntry iphostentry = Dns.GetHostByName(strHostName);

// Enumerate IP addresses
foreach(IPAddress ipaddress in iphostentry.AddressList)
{
    ....
}

Edit:

"There's no such thing as a "primary" IP address.

The routing table determines which outward-facing IP address is used depending on the destination IP address (and by extension, the network interface, which itself can be virtual or physical)."

Get IP address in a console application

The easiest way to do this is as follows:

using System;
using System.Net;


namespace ConsoleTest
{
    class Program
    {
        static void Main()
        {
            String strHostName = string.Empty;
            // Getting Ip address of local machine...
            // First get the host name of local machine.
            strHostName = Dns.GetHostName();
            Console.WriteLine("Local Machine's Host Name: " + strHostName);
            // Then using host name, get the IP address list..
            IPHostEntry ipEntry = Dns.GetHostEntry(strHostName);
            IPAddress[] addr = ipEntry.AddressList;

            for (int i = 0; i < addr.Length; i++)
            {
                Console.WriteLine("IP Address {0}: {1} ", i, addr[i].ToString());
            }
            Console.ReadLine();
        }
    }
}

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