What is a C-class IP?

comcenter · 08-23-2008, 06:01 AM

Hello Everyone;

I see time and time again webmasters asking for their links to be posted in different c-class ip's.
I looked around a little and looks to me like a regular ip, only with three sets of numbers instead of 4 (xx.xx.xx as opposed to xx.xx.xx.xx). But what is this really, is the internet changing to shorter ip's? Why is this important for seo?

Thanks.

zeruel · 08-24-2008, 04:52 AM

Most webmasters or seo believes that using a different C-class IP can give an impact on their SE rankings, because they can interlink all their sites in a way that they can get 2 separate links instantly. Which proves to be a myth.

In a post by Matt Cutts on Virtual Hosts vs Dedicated IP Addresses, he discussed about this issue.

That's just my

Hope that helps...

comcenter · 08-24-2008, 05:23 AM

Thanks for your comments zeruel;

From what I have been able to gather, a class-c ip is basically an address with three 'ranges', example: 192.168.56 as aopposed to a regular ip with an additional number at the end to complete all three ranges.

So there could be several ip addresses within the same class-c ip:

192.168.56 - class-c ip
192.168.56.195
192.168.56.196 ...

Perhaps, it would gain in importance from the Google search engine point of view the fact that your backlinks come from different class-c ip's, meaning they don't come from the same website, server, or even the same geographical location.

I have two ip addresses running in my server where I host my websites, but I noticed they are the same root domain. Anyone who has installed a local network before knows that the dns root must be the same for all clients in the network, in order to have a different dns root you must install another server.

Again, I'm just throwing ideas in the air based on experience, you can correct me anytime...

Erick.

zeruel · 08-24-2008, 06:01 AM

Good info. Anyway, as i've said, checkout Matt Cutts' post regarding the issue...

Rick2 · 08-24-2008, 09:35 AM

So you don't have to worry about all your sites being on the same shared server. I've been wondering about that for a while now, but never really looked into it. Thanks for the info.

comcenter · 08-24-2008, 03:33 PM

Quote:

Originally Posted by Rick2

So you don't have to worry about all your sites being on the same shared server. I've been wondering about that for a while now, but never really looked into it. Thanks for the info.

That would only be the case if you have purchased a unique ip. Most hosting companies will provide a "shared" ip, which you will not only share with other sites in your account but with other sites in the server.
You can get around this by purchasing a unique ip address.

Rick2 · 08-24-2008, 03:40 PM

Quote:

Originally Posted by comcenter

That would only be the case if you have purchased a unique ip. Most hosting companies will provide a "shared" ip, which you will not only share with other sites in your account but with other sites in the server.
You can get around this by purchasing a unique ip address.

Yea, I have to do that. I just learned about this recently, but I do know it's only a few dollars extra to get the unique IP.

abercrombie · 08-24-2008, 08:09 PM

comcenter, i would say class C ip addresses is cause for the confusion. think of it more as class C network.

Class A network 16,277,214 IPs (fortune 100 companies AT&T, HP, etc...)
Class B network 65,534 IPs (for large fortune 500 maybe like Qualcomm)
Class C network 254 IPs (companies that may need IPs in blocks of 254 at a time like ISPs or web hosts)

IPV4 is a 32 bit address and you don't leave off the last octet. The first three octets are the same which is why you'll see references to only 3 sets of numbers such as 121.23.3 supposed to mean 121.23.3.1 to 121.23.3.254.

IndiaNets · 09-19-2008, 05:56 PM

Quote:

Originally Posted by comcenter

I see time and time again webmasters asking for their links to be posted in different c-class ip's.
I looked around a little and looks to me like a regular ip, only with three sets of numbers instead of 4 (xx.xx.xx as opposed to xx.xx.xx.xx). But what is this really, is the internet changing to shorter ip's? Why is this important for seo?

Hello mate,

All IPv4 IPs which we use generally consists of 32 bits which is represented with 4 decimal numbers separated by dots(.) for easiness in reading writing and remembering.

For example :
10.11.12.13 is an IP which represents 00001010.00001011.00001100.00001101 in binary

The 4 separate decimals are 4 classes of the IP as per classless convention..

So, for IP 10.11.12.13...

10 = A Class
11 = B Class
12 = C Class
13 = D Class

Now about C Class IPs

First of all, Internet is not changing to shorter IPs.

In terms of SEO(SEO hosting more specifically) C Class IPs implies Different C Class IPs, more clearly IPs on different C Classes.

For example IPs 1.1.1.1 and 1.1.1.2 are same C Class as 1.1.1 is common in both.

But IPs 1.1.1.2 and 1.1.2.2 are on different C Class as they are on different c classes 1.1.1 and 1.1.2 respectively.

Similarly 1.1.1.1 and 1.2.2.2 are on different B Classes.
1.1.1.1 and 2.1.1.1 are on different A Classes.

Hope this makes sence

How it is important for SEO?

Yes, it is most important and we realize this. You can go for some Multiple C Class IP hosting providers. They let you host your sites on different c class IPs.

This is mostly related to Google Patent which can be seen at v7n blog
here http://blog.v7n.com/2007/10/02/seo-and-web-hosting/

Even our forum where we are discussing strongly follows this concept

Here are the words from ADMIN from the blog mentioned above...

Quote:

We here at v7n own a hundred or so sites, and for the most part they do not participate in inter-linking schemes. Why? Because they are on different topics. Health, finance, travel, etc. Inter-linking those sites would not create much in the way of link popularity, but we still host them each on different IP ranges. The reason for this is, in one word, Google.

Hope this helps!

Quote:

Originally Posted by Rick2

Yea, I have to do that. I just learned about this recently, but I do know it's only a few dollars extra to get the unique IP.

Hello Rick!

Yes, and remember.. only unique IPs will not do the things, you need to have those IPs on different C Classes, can see more about it in the blog mentioned above.

Best Regards,
Vijay,
Indianets.com

MaddenGods · 09-19-2008, 06:44 PM

Quote:

Originally Posted by IndiaNets

Hello mate,

All IPv4 IPs which we use generally consists of 32 bits which is represented with 4 decimal numbers separated by dots(.) for easiness in reading writing and remembering.

For example :
10.11.12.13 is an IP which represents 00001010.00001011.00001100.00001101 in binary

The 4 separate decimals are 4 classes of the IP as per classless convention..

So, for IP 10.11.12.13...

10 = A Class
11 = B Class
12 = C Class
13 = D Class

Now about C Class IPs

First of all, Internet is not changing to shorter IPs.

In terms of SEO(SEO hosting more specifically) C Class IPs implies Different C Class IPs, more clearly IPs on different C Classes.

For example IPs 1.1.1.1 and 1.1.1.2 are same C Class as 1.1.1 is common in both.

But IPs 1.1.1.2 and 1.1.2.2 are on different C Class as they are on different c classes 1.1.1 and 1.1.2 respectively.

Similarly 1.1.1.1 and 1.2.2.2 are on different B Classes.
1.1.1.1 and 2.1.1.1 are on different A Classes.

Hope this makes sence

How it is important for SEO?

Yes, it is most important and we realize this. You can go for some Multiple C Class IP hosting providers. They let you host your sites on different c class IPs.

This is mostly related to Google Patent which can be seen at v7n blog
here http://blog.v7n.com/2007/10/02/seo-and-web-hosting/

Even our forum where we are discussing strongly follows this concept

Here are the words from ADMIN from the blog mentioned above...

Hope this helps!

Hello Rick!

Yes, and remember.. only unique IPs will not do the things, you need to have those IPs on different C Classes, can see more about it in the blog mentioned above.

Best Regards,
Vijay,
Indianets.com

Thats a nice post, thanks for it.

comcenter · 08-25-2008, 04:54 AM

However, If you take a look at this page, and type in any addreess, ex. "www.v7n.com",
the script will output both, the regular ip address and c-class range.

ppc-han · 08-25-2008, 10:13 AM

thanks for the information about ip i always wanted to know about this stuff.

broadcast-monitors · 08-25-2008, 10:55 PM

I think what Matt Cutts is saying is that whitehat sites don't have to worry if there are other websites being hosted on the same IP.

Linking to your own websites might not be kosher. e.g. if there is excessive linking to websites on the same IP, that would look like spam to me. A whitehat site might have a few links like that... e.g. blogger or wordpress blogs might link to other such blogs. But if the % is something unnatural, then that would seem like a red flag to me.

Ive seen my PR go down after linking to my own sites (same IP), so perhaps Google didn't like that. Or maybe it thought I was selling links. I don't know.

cabron · 08-28-2008, 05:28 PM

Interlinking on the same C class would affect your seo (tested by a seo-guy with which i work). Also link exchanges are no good.

And what Matt said is perfectly true, having 1 site on 1 ip or 1000 is the same thing. The OP wanted to know about C class IPs and that is another thing altoghether.