I'm new to this "IPv6" and "C-Blocks" then this article IPv6, C-Blocks, and how they affect SEO posted by Tom Anthony from the Moz blog site. This will discuss and introduce a brief information about IP addresses (v4) & c-blocks. Now if you are done reading this content kindly give your analysis and opinions regarding this new article. Kindly visit this link for your preference and carefully study the said content and determine how it is true that they affect SEO. http://moz.com/blog/ipv6-cblocks-and-seo 