a me questo funzia bene
codice:<%@LANGUAGE = JScript%> <% var url = "http://www.html.it"; try { var xmlhttp = new ActiveXObject("Microsoft.XMLHTTP"); xmlhttp.Open("GET", url, false); xmlhttp.Send(); if (xmlhttp.Status != 12007) { Response.write("Dominio occupato"); } } catch (e) { Response.Write("Dominio libero"); } %>![]()