企业用.net域名

using System;
using System.Net;

class Program
{
    static void Main()
    {
        string domainName = "example.net";
        string url = $"http://{domainName}";

        try
        {
            HttpWebRequest request = (HttpWebRequest)WebRequest.Create(url);
            request.Method = "HEAD";
            HttpWebResponse response = (HttpWebResponse)request.GetResponse();

            if (response.StatusCode == HttpStatusCode.OK)
            {
                Console.WriteLine($"{domainName} is available and responding.");
            }
            else
            {
                Console.WriteLine($"{domainName} is not available or responding with status code {response.StatusCode}.");
            }
        }
        catch (WebException ex)
        {
            if (ex.Status == WebExceptionStatus.NameResolutionFailure)
            {
                Console.WriteLine($"{domainName} is not registered or cannot be resolved.");
            }
            else
            {
                Console.WriteLine($"An error occurred: {ex.Message}");
            }
        }
    }
}