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The first number, 123, is the area code, the second, 555, is the exchange, and the third, 1212, is the number

within that exchange. The numbers go from most significant to least significant. 123 probably indicates

“somewhere in this or that state.” 555 means “some county in the state,” and so on. So we can assert that

the person answering the phone at 123.555.1212 is in the same neighborhood as 123.555.1213.

Likewise, IP addresses located in the same C class — that is, addresses that match for the first three

octets (

xxx.xxx.xxx.*

) — are very likely to be nearby, perhaps even on the same server.

When sites are interlinked with many links that come from such similar IP addresses, they will be regarded

suspiciously, and those links may be devalued. For example, a link from

domainA

on

100.100.1.1

to

domainB

on

100.100.1.2

is a link between two such sites. Done excessively, this can be an indicator

for artificial link schemes meant to manipulate the rankings of those web sites. Matt Cutts affirms that

Google scrutinizes this sort of interlinking in his video at

http://www.mattcutts.com/blog/seo-

answers-on-google-video/

.

Perhaps you host quite a few sites with similar themed content for whatever reason, and do not wish

to worry about this. There are a few vendors that offer hosting in multiple C classes. We don’t have

experience working with any of these providers, and do not make any recommendations. This is just

a list of hosting services that we’ve found that offer this particular service. Many of them also offer

custom nameserver and netblock information.

?

http://www.dataracks.net/

?

http://www.gotwebhost.com/

?

http://www.seowebhosting.net/

?

http://www.webhostforseo.com/

TLD of Domain Name for a Link

It is widely believed that

.edu

and

.gov

domain names are less susceptible to manipulation and there-

fore weighed more heavily. This is disputed by some search engine marketers as the actual factor, and

they assert that the same effect may be as a result of the age (most schools and governmental agencies

have had sites for a while), and amount of links that they’ve acquired over time. Matt Cutts coincides

with this view (

http://www.mattcutts.com/blog/another-two-videos/

). It is mostly irrelevant,

however, what the underlying reason is. Getting a link from a site that fits this sort of profile is very

desirable — and most

.edu

and

.gov

domains do.

Link Location

Links prominently presented in content near the center of the page may be regarded by the search

engines as more important. Links embedded in content presented near the bottom of a page are usually

less important; and external links at the bottom of a page to semantically unrelated sites may, at worst,

be a criterion for spam-detection. Presentation location is different than

physical

location. The physical

location within the document was historically important, but is less of a factor more recently. Ideally, the

primary content of a page should be early in the HTML source of a web page, as well as prominently

displayed in the center region of a web page. More on this topic is discussed in Chapter 6, “SE-Friendly

HTML and JavaScript.”

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Chapter 2: A Primer in Basic SEO

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