Google Pagerank and "Class-C Addresses"

Joe Greco jgreco at
Tue Sep 22 14:58:53 UTC 2009

> On a similar issue, I have a debate going on in my company about SEO
> and links coming from IP blocks allocated from different upstream
> providers will improve page ranks.  (So, if I have block A from
> provider 1 and block B from provider 2, web sites linking each other
> on block A & B, the rank will go up)  Not just different /24, /24s
> reassigned from different upstream.
> I can't find anything to prove or dis-prove this theory.  Anyone have
> a link or info on this issue/myth?
> I shared this discussion thread and was told it's only discussing
> different /24, not /24 allocated to different providers.
> As far as I am concerned, if Google used ARIN swip record or routing
> entry, it's going to identify us as the end provider so I can't see
> how who gave us the IP would matter.

If Google's even vaguely smart, they'll know to use a variety of ways
to automatically determine the closeness of IP addresses, including if
they're announced by the same ASN, have the same RDNS suffix, have any
commonalities in SWIP data, etc.

If I were Google and I were engaged in mere link-counting, I would take 
into consideration the statistical figures and note how often a URL is 
referenced from the Internet in general.  Then, I would look at how
often a URL is referenced from "nearby" URL's, exempting URL's that
are obviously components of the organization's web site, and then I 
would have some idea of whether or not someone was trying to game the
system.  This is relatively trivial to do, given the sort of data
Google has on the web.

I am not sure I would want to be on a list of sites-that-have-tried-to-
game-Google.  Who knows what sort of vengeful damage Google might inflict
on your PageRank.  :-)  (Just kidding Google!)  But seriously, just *how*
stupid do people think Google is?  They have massive resources and nutso
bright people who have looked at these problems.  To think that any 
trivially simplistic strategy that's been suggested for *years* now would
have an impact on PageRank strikes me as naive.

... JG
Joe Greco - Network Services - Milwaukee, WI -
"We call it the 'one bite at the apple' rule. Give me one chance [and] then I
won't contact you again." - Direct Marketing Ass'n position on e-mail spam(CNN)
With 24 million small businesses in the US alone, that's way too many apples.

More information about the NANOG mailing list