keyplyr - 6:31 pm on Apr 2, 2013 (gmt 0)
Should be blocked by default? What does that mean? It is good practice to add them to the DENY table?
I generally avoid blocking an entire range because of one rogue IP. Singlehop, for example, is not a bad neighborhood. And Rackspace definitely isn't.
Many webmasters here block hosting companies, colos, data centers, cloud servers. etc by default because normal human traffic does not come from these ranges. What does hit your site from these ranges are scrapers, data miners, and bot nets.
There are several threads in this forum, all listing IP ranges assigned to these agents.