What Are Class C Blocks Of IPs?

[AussieWebmaster]

very thorough response - welcome to the forum

[staceymattew]

Build more C-Class IP quality free backlinks for the website it will be more useful for ranking better in the search engine.

SEOmoz just explained this on their Whiteboard Friday dated 4/24/11 and titled: Which Link Metrics Should I Use? Part 1 of 2 - Whiteboard Friday

I'd post the link, but they'd probably strip it off.

[devv0304]

What’s a C Block IP address?

You might get some conflicting results if you search for information on C Block IP because it often is confused with C Class IP addresses. For our purposes, the IP address is split into lettered sections (or blocks).

AAA.BBB.CCC.DDD

64.62.209.175 is in the same C Block as 64.62.209.10

The C Block is your neighborhood and those in the same C Block are your neighbors.

C Class IP addresses is a reference to the assignment of IP addresses. I’m not going to explain it further here because it just confuses the issue at hand. (If interested, here’s some basic information on IP Classes.)

C Block Links

The question that often comes up is whether links from the same C Block are some sort of red flag. For the most part, links from the same C Block aren’t a problem. It’s okay to get links from your neighbors.

But if you’re only getting links from your neighbors, things start to look a little fishy. Google might suspect that those neighbors aren’t entirely legitimate. A nefarious type might set up a slew of domains and have them all link to each other.

Links from 50 domains but just one C Block will look very strange. Links from 50 domains from 45 C Blocks will look just fine.

Bad C Blocks



Sometimes a bad element can move into your neighborhood. If you’re using a shared hosting provider you’re essentially living in an apartment building. Other people live at that address. If every one of them except for you is a notorious porn site, it might not look so great.

This could even happen on a larger level where an entire C Block has been used for some unsavory purpose. In this instance it’s not just one building that’s dilapidated, it’s the entire neighborhood.

Check Your Neighborhood

Use the Majestic SEO Neighbourhood Checker if you’re moving into a new neighborhood or if you’re just interested in checking up on your neighbors. That’s how I stumbled upon this SEO C Block.

Sure enough mattcutts.com shares a C Block with seoblackhat.com, home of QuadsZilla. C Block neighbors also include Sphinn, Search Engine Land, Search Engine Journal, Wolf-Howl, Search Marketing Expo and Daggle.

None of these sites are getting dinged by association or even by the fact that they link to each other quite frequently.

TL;DR

An IP address is your home. The C Block is your neighborhood. C Block IP is really only important for SEO if you find out your IP is in a C Block slum.

[AussieWebmaster]

great post dev

[cooluks]

Originally Posted by onedodd

Can somebody explain this:
Don't cross-link from any domains that you own or any domains that share the same Class C Block of IPs.
OK I know what cross-linking is but....
I have 5 sites and want to mainly just learn the part about linking sites from the same class C IPs. How do I know if they share the same Class "C" IP?

Can different hosts share the same Class C IP? No laughing - I have to learn sometime.

How do I find out if my sites share the same Class C IP?

Thank You - Joe D.

The question that often comes up is whether links from the same C Block are some sort of red flag. For the most part, links from the same C Block aren’t a problem. It’s okay to get links from your neighbors.

But if you’re only getting links from your neighbors, things start to look a little fishy. Google might suspect that those neighbors aren’t entirely legitimate. A nefarious type might set up a slew of domains and have them all link to each other.

Links from 50 domains but just one C Block will look very strange. Links from 50 domains from 45 C Blocks will look just fine. - by AJ Kohn (Blind Five Year Old)

More at:http://www.blindfiveyearold.com/what...ock-ip-address

Other links related to C class IPs:

http://www.seomoz.org/q/websites-on-...ass-ip-address
http://www.seroundtable.com/archives/013543.html


or follow this thread:http://forums.searchenginewatch.com/...ad.php?t=17768

[jacobobama]

Originally Posted by Mikkel deMib Svendsen

An IP consist of 4 parts AAA.BBB.CCC.xxx - the first part is called A-class, the second part B-class and the third part C-class. So any IP under the last part will be in the same C-class. So for example:

123.123.123.1 and 123.123.123.2 are in the same C-class but
123.123.123.1 and 123.123.124.1 is in two different C-classes

Many smaller hosts only mange one single or very few C-classes and therefore makes it difficult to get multiple IPs in different C-classes if you host all your sites the same place. Larger hosts have many C-classes (I believe some even have almost full B-classes but unless you specifically request your various sites to be on different C-class IPs you still could end up on the same. It's usually not something hosts care about (in relation to SEO and linking)

I think this the best example of C- class ip. C class ip is bad for your great business because it can reduce your web visibility in the SERP this technique involve in black hat seo and it is spamming technique.

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