links from different ip addresses

[jonnyd8]

Hi,
Second post so sorry if its already been covered.

Someone mentioned to me that having links from different ip address is really good for natural listings.

Can anyone elaborate on this?

Thanks

[tedster]

This idea is related the Hilltop algorithm paper [cs.toronto.edu] -- by Krishna Bharat (currently a top memebr of Google research) and George Mihaila.

The Hilltop algorithm has two aspects that seek to discover when linking sites are "affiliated" -- and sharing an IP address is one clue that the link is in place because of an affiliation between the sites, rather than a true "we think this site is worth a link."

We define two hosts as affiliated if one or both of the following is true:
1. They share the same first 3 octets of the IP address.
2. The rightmost non-generic token in the hostname is the same.

... in comparing "www.ibm.com" and "ibm.co.mx" we ignore the
generic suffixes ".com" and ".co.mx" respectively. The resulting
rightmost token is "ibm", which is the same in both cases. Hence
they are considered to be affiliated.

Also important is last year's Google Patent about using historical factors [appft1.uspto.gov], particularly in this case using IP information to uncover spam.

100...a list of known-bad contact information, name servers, and/or
IP addresses may be identified, stored, and used in predicting the
legitimacy of a domain and, thus, the documents associated therewith.

So having a dedicated IP address, and getting links from quality domains that are not only on different IP addresses, but even different c-blocks, are considered to be quite important as signals of quality.

[jonnyd8]

That's great!

Now I'll try to understand what that means :)

[jonnyd8]

sorry, what's a c-block?

[tedster]

If an IP address is 12.345.678.90, strictly speaking the c-block is "678" -- the third "octet" mentioned in the Hilltop paper.

[Powersg]

If someone were to have three or four web sites that contained similar but unique content/information but targeted to different social groups.

1.Should the sites be on totally different class "A" IP address to achieve a top three first page organic listing?
2.Should they be owned by different companies for domain registration?

Our problem today is that if one site gets a first page ranking the other site that did have a page one ranking drops off. And the bounce back and forth, we can never get two sites listed on the first three pages.

[thgyspsy]

I feel your pain Johnny. I have spent some quality time with both the ‘Hill Top’ and ‘Google Patent’ papers (fun as in paint drying) and I give kudos to tedster for I know the joy of disseminating all those goodies. I started that path with LSI (latent semantic indexing or LSA; analysis).

I essence the algo is looking for people ‘spamming’ it by creating a whole bunch of sites on their server and pointing links to a min one they are targeting. Registration records and class C IP are used to help in identify potential ‘spammers’

That’s a basic idea for you.. help any?

[AjiNIMC]

Google has come a long way. I am sure they are using a mix of Hilltop and other factors to find affiliate sites.