Possible to get the subdomain/directory for a blog w/ condition tag or similar?

I’m trying to get just the subdomain or subdirectory of a blog for a Mu blog.

For example, if my get_bloginfo(siteurl) is http://foo.com/nonce .. what I’m wanting to get is – nonce

Is there something like is_category() for Mu to grab just that?

I tried this:

But it returns the ID # of the root blog and not the subdirectory I’m in…help?

Thanks!