A variation of PageRank whereby links from sites that share the same Class C blocks are worth less than links from a variety of different IP addresses, which are generally different servers owned by different businesses. As you may recall, a Class C block is that number shown in the third position of an IP address. For example, for 255.137. xxx .255, xxx represents the Class C block. This attempts to deal with the problem of different sites owned by the same company that cross-link to each other. Put another way, Google wants to see incoming links that are from different business entities, not different sites owned by the same person.
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