Google Pagerank and "Class-C Addresses"

Joel Jaeggli joelja at
Mon Sep 21 17:20:52 UTC 2009

Got to stop using classful addressing terminology... It's only been 16
or so years and you're not referring to:

Snake-oil salesmen abound in this space. More to the point, any
technique used to sculpt pank-rank scores on a systematic basis is
likely to result in a countervailing adjustment by search engine operators.

Sebastian Wiesinger wrote:
> Hello Nanog,
> I'm looking into a weird request which more and more customers have.
> They want "different Class C addresses", by which they mean IPs in
> different /24 subnets.
> The apparent reason for this is that Google will rank links from
> different /24 higher then links from the same /24. So it's a SEO
> thingy.
> I googled a bit and found pages after pages of FUD and such great
> things as the "Class C Checker":  "This free Class C Checker tool
> allows you to check if some sites are hosted on the same Class C IP
> Range."
> My question is: Is there any proof that Google does differentiate
> between /24s, or even better is there any proof that this isn't the
> case? I will not give a customer space from different address blocks
> just because he read it in a SEO magazine.
> Perhaps someone from Google itself can answer this question?
> Also how do you handle such requests? I expect I'm not the only one
> who gets them.
> Regards,
> Sebastian

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