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My understanding is that google sometimes penalizes a site with too many inbound links from the same C block of IP addresses.
The reason is that once people figured out that google ranked pages based on the number of inbound links, people started building link farms in order to artificially inflate their search rankings. (i.e. make it appear that hundreds of other sites were linking to them, when in fact they were merely linking to themself)
So if your site appears to be a "linkfarm" then google discounts the inbound links coming from the same C block.
If you want to build a linkfarm you most definitely need to spread out your IP addresses as much as possible.
If you're just building a bunch of sites and getting people to link to your site because they like your content, the IP's don't really matter.
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