Youtube Streaming (Geographical Location)

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http://serverfault.com – Is it possible to find out the geographical location (IP Address/host) that I'm streaming a specific Youtube video? I believe not all videos stream from the same Youtube Cache server, correct? By nslookup the v1.lscache1.c.youtube.com it seems by unicast I get resolved to a local cache but I doubt that all videos stream from this locations. Regards, (HowTos)