Added C#

C#/C#.csproj

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+<Project Sdk="Microsoft.NET.Sdk">
+
+  <PropertyGroup>
+    <OutputType>Exe</OutputType>
+    <TargetFramework>net5.0</TargetFramework>
+    <RootNamespace>C_</RootNamespace>
+  </PropertyGroup>
+
+</Project>

C#/Program.cs

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+using System;
+using System.IO;
+using System.Net;
+using System.Text;
+using System.Text.Json;
+using System.Text.Json.Serialization;
+using System.Collections.Generic;
+using System.Linq;
+
+class WebRequests
+{	
+	public static void Main()
+	{
+		int times = 3000;
+		string[] domains = new string[]{".co", ".com", ".net", ".edu", ".gov", ".cn", ".org", ".cc", ".us", ".mil", ".ac", ".it", ".de"};
+		string[] mode = new string[]{"http", "https"};
+		bool log = true;
+		int mini = 2;
+		int maxi = 50;
+		int second = 1;
+
+		List<data> _data = new List<data>();
+
+		for (int i = 0; i < times; i++)
+		{
+
+			string url = RandomURL(domains, mode, mini, maxi, second);
+			if (log) Console.WriteLine($"{url} ({i+1}/{times})");
+
+			try
+			{
+				WebRequest request = WebRequest.Create(url);
+				request.Credentials = CredentialCache.DefaultCredentials;
+				HttpWebResponse response = (HttpWebResponse)request.GetResponse();
+				// exists, save url and response
+				Console.WriteLine($"{url} exists! {response.StatusDescription}");
+				_data.Add(new data()
+				{
+					website_url = url,
+					response_type = "SUCCESS",
+					response_code = $"{(int)response.StatusCode}",
+					response_details = response.StatusDescription
+				});
+				response.Close();
+			}
+			catch (System.Net.WebException e)
+			{	
+				if (e.InnerException != null)
+				{
+					if (e.InnerException.InnerException != null)
+					{
+						if (e.InnerException.InnerException.GetType() != typeof(System.Net.Sockets.SocketException))
+						{ // exists, save url and exception
+							Console.WriteLine($"{url} exists! {e.InnerException.InnerException.GetType()}");
+							_data.Add(new data()
+							{
+								website_url = url,
+								response_type = "ERROR",
+								response_code = "UNKNOWN", // Haven't found out if there is a way to get the response code from host
+								response_details = $"{e.InnerException.InnerException.GetType()} | {e.Message}"
+							});
+						}
+					}
+				}
+			}
+		}
+
+		string json = JsonSerializer.Serialize(_data);
+		File.WriteAllText("C#_report.json", json);
+	}
+
+	public class data
+	{
+		public string website_url {get; set;}
+		public string response_type {get; set;}
+		public string response_code {get; set;}
+		public string response_details {get; set;}
+	}
+
+	private static Random random = new Random();
+	public static string RandomURL(string[] d, string[] m, int mini, int maxi, int second)
+	{
+		const string chars = "abcdefghijklmnopqrstuvwyxz0123456789";
+
+		string full_url = m[random.Next(m.Length)] + "://"; // Mode (http/https)
+		full_url += new string (Enumerable.Repeat(chars, random.Next(mini, maxi))
+		.Select(s => s[random.Next(s.Length)]).ToArray()); // Domain name (abc69)
+		full_url += d[random.Next(d.Length)]; // Top-level domain (.fr)
+		if (random.Next(100) <= second) full_url += d[random.Next(d.Length)]; // Second-level domain (.co)
+		return full_url;
+	}
+}