IP ADdress

using System;
using System.Net;
using System.Net.Sockets;

public class IPv4String
{
    public static void Main()
    {
        string ipv4String = GetIPv4Address();
        Console.WriteLine("IPv4 Address: " + ipv4String);
    }

    public static string GetIPv4Address()
    {
        string ipv4 = string.Empty;

        foreach (IPAddress ip in Dns.GetHostAddresses(Dns.GetHostName()))
        {
            if (ip.AddressFamily == AddressFamily.InterNetwork)
            {
                ipv4 = ip.ToString();
                break;
            }
        }

        return ipv4;
    }
}

please check with this code.

please accept the answer if it is useful.