I only know rumors, but from what I'm told, it's bad to have all your domains on the same Class C because if Google sees you linking to other domains that are all on, for example, 66.115.135.XXX they can assume that you are linking to other sites that you own or are in your network & hold that against you (knowing that they are all in your own little hub)
But if you link to domains on other Class C's, they treat them as legit link trades & thus hold them in a higer value.
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