Welcome to WebmasterWorld Guest from 220.127.116.11
The IPs hit with a bot-like UA including the word "crawler" on 18.104.22.168/24 - specifically between 22.214.171.124 - 126.96.36.199 but probably most of the /24. There were no proper rDNS entries for the bot IPs.
However, considering Bing is supplying results, does it really matter at the moment?
I continue to treat Y! with respect just as I do Google and Bing.