How Can I Get My Server's IP Address in C#?

Retrieving Your Server's IP Address Using C#

Knowing your server's IP address is crucial for various server-side operations. This guide demonstrates a reliable method for obtaining both your local and, if possible, your external IP address using C#.

Code Implementation

This C# code snippet efficiently retrieves your server's local IP address:

IPHostEntry host;
string localIP = "?";
host = Dns.GetHostEntry(Dns.GetHostName());
foreach (IPAddress ip in host.AddressList)
{
    if (ip.AddressFamily == AddressFamily.InterNetwork)
    {
        localIP = ip.ToString();
        break; // Optimization: Exit loop after finding IPv4 address
    }
}
return localIP;

Code Breakdown

The code first retrieves host information using Dns.GetHostEntry and the hostname from Dns.GetHostName. It then loops through the available IP addresses. The AddressFamily.InterNetwork check ensures we only select IPv4 addresses. The break statement is added for efficiency, exiting the loop once an IPv4 address is found. The function returns the IPv4 address as a string.

External IP Address

The above method only provides the local IP address. Determining the external IP address requires using a third-party service or library, as this information isn't directly accessible locally.

There are no more efficient or accurate alternatives for retrieving the local IP address using built-in .NET functionality. However, external services can supplement this to get the public-facing IP.

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