They say, "Anytime we see a referrer from serach.live.com, we check if the IP is in the range of known IP addresses for their crawler, and if so, we just ignore

They say, "Anytime we see a referrer from serach.live.com, we check if the IP is in the range of known IP addresses for their crawler, and if so, we just ignore it." I filter some stats according to user agent name: Anybody know if these bots use regular (honest) agent names? Or do I need to start searching for "range of knw IP addresses for their crawler?" (Anyone care to share such a range?