How do I get the Local Network IP address of a computer programmatically?


Question

I need to get the actual local network IP address of the computer (e.g. 192.168.0.220) from my program using C# and .NET 3.5. I can't just use 127.0.0.1 in this case.

What's the best way to do this?

1
26
5/6/2019 5:17:48 PM

Accepted Answer

Link It says there, add System.net, and using the following

    //To get the local IP address 
string sHostName = Dns.GetHostName (); 
IPHostEntry ipE = Dns.GetHostByName (sHostName); 
IPAddress [] IpA = ipE.AddressList; 
for (int i = 0; i < IpA.Length; i++) 
{ 
    Console.WriteLine ("IP Address {0}: {1} ", i, IpA[i].ToString ()); 
}
24
9/29/2008 11:53:52 PM

If you are looking for the sort of information that the command line utility, ipconfig, can provide, you should probably be using the System.Net.NetworkInformation namespace.

This sample code will enumerate all of the network interfaces and dump the addresses known for each adapter.

using System;
using System.Net;
using System.Net.NetworkInformation;

class Program
{
    static void Main(string[] args)
    {
        foreach ( NetworkInterface netif in NetworkInterface.GetAllNetworkInterfaces() )
        {
            Console.WriteLine("Network Interface: {0}", netif.Name);
            IPInterfaceProperties properties = netif.GetIPProperties();
            foreach ( IPAddress dns in properties.DnsAddresses )
                Console.WriteLine("\tDNS: {0}", dns);
            foreach ( IPAddressInformation anycast in properties.AnycastAddresses )
                Console.WriteLine("\tAnyCast: {0}", anycast.Address);
            foreach ( IPAddressInformation multicast in properties.MulticastAddresses )
                Console.WriteLine("\tMultiCast: {0}", multicast.Address);
            foreach ( IPAddressInformation unicast in properties.UnicastAddresses )
                Console.WriteLine("\tUniCast: {0}", unicast.Address);
        }
    }
}

You are probably most interested in the UnicastAddresses.


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