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    <p>I spent all day figuring out how to send/receive dns requests and came up with this. Its a complete generic handler. You just have to set the dns server and pass in 'd' eg. my.website.com?d=itmanx.com</p> <pre><code>&lt;%@ WebHandler Language="C#" Class="Handler" %&gt; using System; using System.Web; using System.Text; using System.Net; using System.Net.Sockets; using System.Collections.Generic; public class Handler : IHttpHandler { string dns = "dc1"; //change to your dns string qtype = "15"; //A=1 MX=15 string domain = ""; int[] resp; public void ProcessRequest(HttpContext context) { context.Response.ContentType = "text/plain"; try { if (context.Request["t"] != null) qtype = context.Request["t"]; if (context.Request["d"] != null) domain = context.Request["d"]; if (string.IsNullOrEmpty(domain)) throw new Exception("Add ?d=&lt;domain name&gt; to url or post data"); Do(context); } catch (Exception ex) { string msg = ex.Message; if (msg == "1") msg = "Malformed packet"; else if (msg == "5") msg = "Refused"; else if (msg == "131") msg = "No such name"; context.Response.Write("Error: " + msg); } } public void Do(HttpContext context) { UdpClient udpc = new UdpClient(dns, 53); // SEND REQUEST-------------------- List&lt;byte&gt; list = new List&lt;byte&gt;(); list.AddRange(new byte[] { 88, 89, 1, 0, 0, 1, 0, 0, 0, 0, 0, 0 }); string[] tmp = domain.Split('.'); foreach (string s in tmp) { list.Add(Convert.ToByte(s.Length)); char[] chars = s.ToCharArray(); foreach (char c in chars) list.Add(Convert.ToByte(Convert.ToInt32(c))); } list.AddRange(new byte[] { 0, 0, Convert.ToByte(qtype), 0, 1 }); byte[] req = new byte[list.Count]; for (int i = 0; i &lt; list.Count; i++) { req[i] = list[i]; } udpc.Send(req, req.Length); // RECEIVE RESPONSE-------------- IPEndPoint ep = null; byte[] recv = udpc.Receive(ref ep); udpc.Close(); resp = new int[recv.Length]; for (int i = 0; i &lt; resp.Length; i++) resp[i] = Convert.ToInt32(recv[i]); int status = resp[3]; if (status != 128) throw new Exception(string.Format("{0}", status)); int answers = resp[7]; if (answers == 0) throw new Exception("No results"); int pos = domain.Length + 18; if (qtype == "15") // MX record { while (answers &gt; 0) { int preference = resp[pos + 13]; pos += 14; //offset string str = GetMXRecord(pos, out pos); context.Response.Write(string.Format("{0}: {1}\n", preference, str)); answers--; } } else if (qtype == "1") // A record { while (answers &gt; 0) { pos += 11; //offset string str = GetARecord(ref pos); context.Response.Write(string.Format("{0}\n", str)); answers--; } } } //------------------------------------------------------ private string GetARecord(ref int start) { StringBuilder sb = new StringBuilder(); int len = resp[start]; for (int i = start; i &lt; start + len; i++) { if (sb.Length &gt; 0) sb.Append("."); sb.Append(resp[i + 1]); } start += len + 1; return sb.ToString(); } private string GetMXRecord(int start, out int pos) { StringBuilder sb = new StringBuilder(); int len = resp[start]; while (len &gt; 0) { if (len != 192) { if (sb.Length &gt; 0) sb.Append("."); for (int i = start; i &lt; start + len; i++) sb.Append(Convert.ToChar(resp[i + 1])); start += len + 1; len = resp[start]; } if (len == 192) { int newpos = resp[start + 1]; if (sb.Length &gt; 0) sb.Append("."); sb.Append(GetMXRecord(newpos, out newpos)); start++; break; } } pos = start + 1; return sb.ToString(); } //------------------------------------------------------ public bool IsReusable { get { return false; } } } </code></pre>
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    1. POHow to get mx records for a dns name with System.Net.DNS?
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    1. USChristian
    1. USChristian
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    1. COSome web hosting providers will not allow System.Net.SocketPermission. If you get a "Request for the permission of type 'System.Net.SocketPermission... failed", speak very nicely to your hosting provider :)
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    2. COnice one .. thank for your effort :)
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    3. COThis is great - thanks for posting this.
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      1. USEyeball
 

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