The form of URL you want, according to your example, requires sub-domain, by definition. The string in your example fully belongs to the part of the
URI scheme, called "host name", which is a part of "authority". It should be clear from this:
http://en.wikipedia.org/wiki/DNS[
^],
http://en.wikipedia.org/wiki/Sub-domain[
^],
http://en.wikipedia.org/wiki/URI_scheme[
^].
The host name, as a part of authority, is not defined by the Web site. You cannot dynamically introduce sub-domains, because it need update of DNS data and propagation of it, something which is not accessible to the Web application using those sub-domains.
Practically, you need to find some alternative forms of re-written URL. Please see:
http://en.wikipedia.org/wiki/Rewrite_engine[
^],
http://msdn.microsoft.com/en-us/library/ms972974.aspx[
^].
See also:
http://msdn.microsoft.com/en-us/library/vstudio/cc668201%28v=vs.100%29.aspx[
^].
—SA
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