<html><body style="word-wrap: break-word; -webkit-nbsp-mode: space; -webkit-line-break: after-white-space; "><div>I would think that any server-name should be permissible for any domain. However, the IP should only be used in the case of a self-referential entry (your first case).</div><div><br></div><div>Is there any legitimate reason for someone to give an IP for a name-server that differs from the authoritative source? That is, if the authoritative name-server for myisp.com resolves ns1.myisp.com to 1.2.3.4, is there any valid reason for someone to register example.com with a name-server of ns1.myisp.com and an IP of 4.5.6.7?</div><div><br></div><div> <span class="Apple-style-span" style="border-collapse: separate; border-spacing: 0px 0px; color: rgb(0, 0, 0); font-family: Helvetica; font-size: 12px; font-style: normal; font-variant: normal; font-weight: normal; letter-spacing: normal; line-height: normal; text-align: auto; -khtml-text-decorations-in-effect: none; text-indent: 0px; -apple-text-size-adjust: auto; text-transform: none; orphans: 2; white-space: normal; widows: 2; word-spacing: 0px; "><div style="word-wrap: break-word; -khtml-nbsp-mode: space; -khtml-line-break: after-white-space; "><p style="margin: 0.0px 0.0px 0.0px 0.0px"><font face="Helvetica" size="3" style="font: 12.0px Helvetica">--</font></p><p style="margin: 0.0px 0.0px 0.0px 0.0px"><font face="Helvetica" size="3" style="font: 12.0px Helvetica"><b style="font-weight: bold; "><span class="Apple-style-span" style="font-weight: bold; ">Milo Hyson</span></b></font></p><p style="margin: 0.0px 0.0px 0.0px 0.0px">Chief Scientist</p><p style="margin: 0.0px 0.0px 0.0px 0.0px"><font face="Helvetica" size="3" style="font: 12.0px Helvetica">CyberLife Labs</font></p><br class="Apple-interchange-newline"></div></span> </div><br><div><div>On Jan 8, 2009, at 03:15, Matus UHLAR - fantomas wrote:</div><br><blockquote type="cite"><div>If I register example.com, it's OK to register _anything_.example.com as<br>glue. However, registering _anything_.example.net should not be accepted.<br><br>I wonder how is it possible that anyone accepts that. <br></div></blockquote></div></body></html>