How Can I Get the Local LAN IP Address of a Network-Connected Device in C#?

Accessing a Network Device's Local IP Address using C#

This article tackles a frequent programming problem: retrieving the local IP address of a machine running a C# application. We'll demonstrate how to:

1. Obtain the LAN IP address of a network-connected device.
2. Verify network connectivity.

Retrieving the LAN IP Address

Standard methods for getting a local machine's IP address might return multiple addresses, making it difficult to identify the LAN IP. The solution below addresses this issue.

C# Code for Obtaining the LAN IP Address

This refined code snippet reliably retrieves the LAN 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 IPv4 network adapters found!");
}

Confirming Network Availability

The following simple method checks for an active network connection:

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

This returns a boolean value indicating the presence of a network connection.

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