While google did file a patent long ago about class C's and whois info being a part of something they may institute they ended up focusing more on grammar choices and other similarities to flush out same authors creating networks trying to mimic a natural network.
As it turns out hosting companies like Godaddy and Gator might have 100 people in a similar niche spread over 50 shared IPs so the whole class C thing wasn't going to work out.
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