Although you asked for DNS servers - it helps to remember that no matter what the servers and resolvers do - IE will bring that behaviour to naught in many cases<br><br>http://support.microsoft.com/default.aspx?scid=KB;en-us;263558<br><br><br><b><i>"Thurman, Steven" &lt;steven.thurman@wamu.net&gt;</i></b> wrote:<blockquote class="replbq" style="border-left: 2px solid rgb(16, 16, 255); margin-left: 5px; padding-left: 5px;">    <meta http-equiv="Content-Type" content="text/html; charset=us-ascii"> <meta name="Generator" content="MS Exchange Server version 6.5.7233.50"><title>DNS TTL adherence</title>   <!-- Converted from text/rtf format -->  <div align="left"><span lang="en-us"><font face="Arial" size="2">Does anyone know if there is a research paper or statistics related to what percentage of DNS servers do not adhere to advertised TTL</font></span><span lang="en-us"></span><span lang="en-us"><font face="Arial" size="2">’</font></span><span lang="en-us"></span><span
 lang="en-us"><font face="Arial" size="2">s? I am looking for some verifiable research on this topic if it is available.</font></span><span lang="en-us"></span><span lang="en-us"></span></div>  <div align="left"><span lang="en-us"><font face="Arial" size="2">Thanks,</font></span></div> <br>  <div align="left"><span lang="en-us"><font face="Arial" size="2">Steve</font></span><span lang="en-us"></span><span lang="en-us"></span></div>  </blockquote><br>