As long as you're there, I've also got the adjoining 23.19 blocked. Server farm, apparently.
And, in the other direction: if 184.108.40.206/14 is still Comcast Business, they're probably expendable as well.
Come to think of it, I don't see much of anything in 23 except for a couple of Canadian IPs. Most of the range is-- or was until recently-- unassigned, so I'd expect a lot of filling-in over the next couple of years.
Just a FYI - Comcast Biz also includes all those employees who surf from their desks. We had a lengthy discussion about this last year. I spot checked through a year's logs and found thousands of human hits from inside that range (I had also considered blocked it.)
Comcast Biz also includes all those employees who surf from their desks.
Ah ha. I don't think I've formally blocked any of their (many, many, many) ranges for that very reason: Just when you think it's completely useless, you get a bona fide human. And in my case it can be very hard to tell if they're goofing off or looking up something work-related ;)
I'm not aware of any Yahoo crawlers, rather AFAIK Yahoo uses the crawls by MSN/Bing for their SERPS.
Somebody else may be able to provide IP's.
All I have documented since reactivation in February are Yahoo utilities, which I do not allow. I haven't had any full crawls from anything that has identified itself itself as Yahoo, Slurp, or Inktomi since same reactivation.