Updated

EonaCat.DnsTester/MainForm.Designer.cs

@@ -55,6 +55,9 @@
             this.txtResolveHost = new System.Windows.Forms.TextBox();
             this.btnResolveIP = new System.Windows.Forms.Button();
             this.btnResolveHost = new System.Windows.Forms.Button();
+            this.label3 = new System.Windows.Forms.Label();
+            this.numericUpDown1 = new System.Windows.Forms.NumericUpDown();
+            ((System.ComponentModel.ISupportInitialize)(this.numericUpDown1)).BeginInit();
             this.SuspendLayout();
             // 
             // ResultView
@@ -308,6 +311,27 @@
             this.btnResolveHost.UseVisualStyleBackColor = true;
             this.btnResolveHost.Click += new System.EventHandler(this.btnResolveHost_Click);
             // 
+            // label3
+            // 
+            this.label3.AutoSize = true;
+            this.label3.Location = new System.Drawing.Point(675, 223);
+            this.label3.Name = "label3";
+            this.label3.Size = new System.Drawing.Size(201, 32);
+            this.label3.TabIndex = 32;
+            this.label3.Text = "Total domains:";
+            // 
+            // numericUpDown1
+            // 
+            this.numericUpDown1.Location = new System.Drawing.Point(913, 223);
+            this.numericUpDown1.Maximum = new decimal(new int[] {
+            10000000,
+            0,
+            0,
+            0});
+            this.numericUpDown1.Name = "numericUpDown1";
+            this.numericUpDown1.Size = new System.Drawing.Size(120, 38);
+            this.numericUpDown1.TabIndex = 33;
+            // 
             // MainForm
             // 
             this.AutoScaleDimensions = new System.Drawing.SizeF(240F, 240F);
@@ -315,6 +339,8 @@
             this.AutoSize = true;
             this.AutoSizeMode = System.Windows.Forms.AutoSizeMode.GrowAndShrink;
             this.ClientSize = new System.Drawing.Size(2517, 1693);
+            this.Controls.Add(this.numericUpDown1);
+            this.Controls.Add(this.label3);
             this.Controls.Add(this.btnResolveHost);
             this.Controls.Add(this.btnResolveIP);
             this.Controls.Add(this.txtResolveHost);
@@ -343,6 +369,7 @@
             this.StartPosition = System.Windows.Forms.FormStartPosition.CenterScreen;
             this.Text = "EonaCat.DnsTester";
             this.Load += new System.EventHandler(this.TesterUI_Load);
+            ((System.ComponentModel.ISupportInitialize)(this.numericUpDown1)).EndInit();
             this.ResumeLayout(false);
             this.PerformLayout();
 
@@ -376,6 +403,8 @@
         private System.Windows.Forms.TextBox txtResolveHost;
         private System.Windows.Forms.Button btnResolveIP;
         private System.Windows.Forms.Button btnResolveHost;
+        private System.Windows.Forms.Label label3;
+        private System.Windows.Forms.NumericUpDown numericUpDown1;
     }
 }
 

EonaCat.DnsTester/MainForm.cs

@@ -1,4 +1,5 @@
 using System;
+using System.Collections.Generic;
 using System.Data;
 using System.IO;
 using System.Linq;
@@ -28,8 +29,7 @@ namespace EonaCat.DnsTester
         private void RunTest_Click(object sender, EventArgs e)
         {
             int i;
-            string[] CleanNames = new string[500];
+            List<string> CleanNames = new List<string>();
-            int CleanNamesCount = 0;
 
             if (this.UseCustomDnsServers)
             {
@@ -61,9 +61,9 @@ namespace EonaCat.DnsTester
 			ResultView.Update();
 			Application.DoEvents();
 			
-			GetWebAddresses(ref CleanNames, ref CleanNamesCount);
+			GetWebAddresses(ref CleanNames, (int)numericUpDown1.Value);
 
-			for (i = 0; i < CleanNamesCount; i++)
+			for (i = 0; i < CleanNames.Count; i++)
 			{
 				ListViewItem listURL = new ListViewItem(CleanNames[i]);
 				listURL.SubItems.Add(" ");
@@ -87,7 +87,7 @@ namespace EonaCat.DnsTester
 			}
 
             IsRunning = true;
-            CheckDNS(CleanNames, CleanNamesCount, DNS1, DNS2);
+            CheckDNS(CleanNames.ToArray(), CleanNames.Count, DNS1, DNS2);
 			IsRunning = false;
 		}
 
@@ -156,7 +156,7 @@ namespace EonaCat.DnsTester
 
 
 
-		private void GetWebAddresses(ref string[] CleanNames, ref int CleanNamesCount)
+		private void GetWebAddresses(ref List<string> CleanNames, int totalUrls)
 		{
 			int i, j;
 			byte[] random = new Byte[256];
@@ -173,74 +173,116 @@ namespace EonaCat.DnsTester
 				if (Letters.Length == 3) break;
 			}
 
-			// Use Google to get random addresses for DNS testing
+            KeyValuePair<string, string> searchEngine = new KeyValuePair<string, string>();
+            Random rand = new Random();
 
-			// Initialize the WebRequest.
+            // Create a list of search engine URLs to query
+            Dictionary<string, string> searchEngineUrls = new Dictionary<string, string>
+            {
+                { "DuckDuckGo", "https://duckduckgo.com/html/?q=" },
+                { "Yahoo", "https://search.yahoo.com/search?p=" },
+                { "Bing", "https://www.bing.com/search?q=" },
+                { "Google", "https://www.google.com/search?q=" },
+                { "Ask", "https://www.ask.com/web?q=" },
+                { "AOL", "https://www.aol.com/search?q=" },
+                { "WolframAlpha", "https://www.wolframalpha.com/input/?i=" },
+                { "StartPage", "https://www.startpage.com/do/dsearch?query=" },
+                { "Yandex", "https://www.yandex.com/search/?text=" },
+                { "Qwant", "https://www.qwant.com/?q=" }
+            };
 
-			StatusBoxPrint("Getting Google request");
+            try
-			try
+            {
+                while (CleanNames.Count < totalUrls)
+                {
+                    int index = rand.Next(searchEngineUrls.Count);
+                    searchEngine = searchEngineUrls.ElementAt(index);
+
+                    WebRequest Request = WebRequest.Create(searchEngine.Value + Letters); //Letters);
+                    WebResponse Response = Request.GetResponse();
+                    Application.DoEvents();
+                    
+                    // Get the response stream.
+                    Stream Stream = Response.GetResponseStream();
+                    StatusBoxPrint(searchEngine.Key + " response received");
+
+                    StreamReader StreamReader = new StreamReader(Stream, Encoding.ASCII);
+                    string ResponseString = StreamReader.ReadToEnd();
+                    
+                    // Close the response stream and response to free resources.
+                    Stream.Close();
+                    Response.Close();
+                    Application.DoEvents();
+
+                    // find all .xxx.com addresses
+                    MatchCollection HostNames;
+                    string[] Names = new string[totalUrls + 1000];
+
+                    // Create a new Regex object and define the regular expression.
+                    Regex Dotcom = new Regex("[.]([A-Za-z]*)[.]com");
+
+
+                    // Use the Matches method to find all matches in the input string.
+                    HostNames = Dotcom.Matches(ResponseString);
+
+                    Application.DoEvents();
+
+                    // Loop through the match collection to retrieve all 
+                    // matches and delete the leading "."
+                    for (i = 0; i < HostNames.Count; i++)
+                    {
+                        Names[i] = HostNames[i].Value.Remove(0, 1);
+                    }
+
+                    // eliminate its own search engine names and repeated entries
+                    for (i = 0; i < HostNames.Count - 1; i++)
+                    {
+                        if (Names[i] == searchEngine.Key.ToLower() + ".com") Names[i] = "";
+                        for (j = i + 1; j < HostNames.Count; j++)
+                        {
+                            if (Names[i] == Names[j]) Names[j] = "";
+                        }
+                    }
+
+                    Shuffle(Names);
+
+					// Add the names to the list
+                    for (i = 0; i < HostNames.Count; i++)
+                    {
+                        if (CleanNames.Count >= totalUrls)
+                        {
+                            break;
+                        }
+
+                        if (!string.IsNullOrEmpty(Names[i]) && !CleanNames.Contains(Names[i]))
+                        {
+                            CleanNames.Add(Names[i]);
+                        }
+                    }
+                }
+                StatusBoxPrint(CleanNames.Count + " Random URL's found");
+            }
+			catch(Exception exception)
 			{
-				WebRequest GoogleRequest = WebRequest.Create("http://www.google.com/search?num=100&q=" + Letters); //Letters);
+				StatusBoxPrint(searchEngine.Key + ": " ?? string.Empty + exception.Message);
-				WebResponse GoogleResponse = GoogleRequest.GetResponse();
-				Application.DoEvents();
-				// Get the response stream.
-				Stream GoogleStream = GoogleResponse.GetResponseStream();
-				StatusBoxPrint("Google response received");
-				// Use a StreamReader to read the entire response.
-
-				StreamReader GoogleReader = new StreamReader(GoogleStream, Encoding.ASCII);
-				string GoogleString = GoogleReader.ReadToEnd();
-				// Close the response stream and response to free resources.
-				GoogleStream.Close();
-				GoogleResponse.Close();
-				Application.DoEvents();
-
-				// find all .xxx.com addresses
-				MatchCollection HostNames;
-				string[] Names = new string[1000];
-				// Create a new Regex object and define the regular expression.
-				Regex Dotcom = new Regex("[.]([A-Za-z]*)[.]com");
-				// Use the Matches method to find all matches in the input string.
-				HostNames = Dotcom.Matches(GoogleString);
-
-				Application.DoEvents();
-				// Loop through the match collection to retrieve all 
-				// matches and delete the leading "."
-				for (i = 0; i < HostNames.Count; i++)
-				{
-					Names[i] = HostNames[i].Value.Remove(0, 1);
-				}
-				// eliminate google.com and repeated entries
-				for (i = 0; i < HostNames.Count - 1; i++)
-				{
-					if (Names[i] == "google.com") Names[i] = "";
-					for (j = i + 1; j < HostNames.Count; j++)
-					{
-						if (Names[i] == Names[j]) Names[j] = "";
-					}
-				}
-				// count list and compact
-				j = 0;
-				for (i = 0; i < HostNames.Count; i++)
-				{
-					if (Names[i] != "")
-					{
-						CleanNames[j] = Names[i];
-						j++;
-					}
-				}
-				CleanNamesCount = j;
-				StatusBoxPrint(CleanNamesCount + " Random URL's found");
-
-			}
-			catch
-			{
-				StatusBoxPrint("Host Google.com not found - are you connected ?");
 			}
+        }
 
-		}
+        public static void Shuffle<T>(T[] array)
+        {
+            Random rng = new Random();
+            int n = array.Length;
+            while (n > 1)
+            {
+                n--;
+                int k = rng.Next(n + 1);
+                T value = array[k];
+                array[k] = array[n];
+                array[n] = value;
+            }
+        }
 
-		private void CheckDNS(string[] URLNames, int URLNamescount, string DNSAddress1, string DNSAddress2)
+        private void CheckDNS(string[] URLNames, int URLNamescount, string DNSAddress1, string DNSAddress2)
 		{
 			int i;
 			const int IPPort = 53;
@@ -299,11 +341,13 @@ namespace EonaCat.DnsTester
 			}
 
 			byte[] Receivebytes = new byte[512];
+            int totalReceived = 0;
 
-			try
+            try
 			{
 			// wait for a response up to timeout
-			more: DNSsocket.Receive(Receivebytes);
+			more:
+            DNSsocket.Receive(Receivebytes);
 				// make sure the message returned is ours
 				if (Receivebytes[0] == Sendbytes[0] && (Receivebytes[1] == 0x31) || (Receivebytes[1] == 0x32))
 				{
@@ -378,11 +422,17 @@ namespace EonaCat.DnsTester
 										ResultView.Items[i].ForeColor = System.Drawing.Color.Black;
 										break;
 								}
-							}
+
+                                totalReceived++;
+                            }
 						}
 					}
-					goto more;
+
-				}
+                    if (totalReceived < URLNamescount)
+                    {
+                        goto more;
+                    }
+                }
 			}
 			catch (SocketException e)
 			{