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These items, what ever they are referred to have not been used by any of the hosts I've had. I do realize that some hosts do provide these references (what ever their called) rather than IP ranges.
george's canufly provided the Yahoo range:
A typical Yahoo UA is:
"Mozilla/5.0 (compatible; Yahoo! Slurp; [help.yahoo.com...]
My question is if anyone knows the purpose of this crawler and if it is really associated with yahoo.