<darshan.karandikar@xxxxxxx> wrote: > Is "www.my.domain.again.my.domain.com" a valid URL on INTERNET? It's a valid relative URL, but I think that's not what you want to know... > I know that "http://my.domain.again.my.domain.com"; can be a > valid INTERNET DNS address ...the other way around it makes sense: Your first string is a syntactically valid DNS domain name, and your second string is a valid HTTP URL for this domain. Just in case you could add a trailing dot to your first string, and a trailing slash to your second string. For technical details about URIs please look in <http://tools.ietf.org/html/rfc3986>. If you have questions about RFC 3986 better ask them on the URI list uri@xxxxxxx, see <http://dir.gmane.org/gmane.org.w3c.uri>. > Does "www" has any significance in this URL when it comes to > DNS name resolution? Yes, the strings without www are different, you could end up at a different host. Or in the case of the URL you could get a different homepage or an error. Often Web servers arrange that you get the same content, but that is not required. Check out RFC 4367 for some details. Frank -- Please don't post on IETF lists with private disclaimers, see <http://www.ietf.org/maillist.html>. _______________________________________________ Ietf@xxxxxxxx https://www.ietf.org/mailman/listinfo/ietf