We are using an ASP Component to lookup host names of IP addresses. <BR>We are trying to get the host name for a goup of machines on an Intranet that are accessing our web site which is on the Internet. Sometimes it works and other times it returns "host name not found"<BR><BR>It has always been to my understanding that reverse dns can be influenced by several things and therefore is not fail safe. Most importantly there internal network. Can anyone shed some light?