NinjaSteve

How can I check to see if multiple IPs or domains are hosted on the same class C?

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Supz

Xxx.xxx.xxx.*

WiredGuy

1) Do ip lookup on domain
2) If ccc in the following is the same for all domains/ips: aaa.bbb.ccc.*
Then you're on the same c-block.

WG

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baddog

I presume you mean how can you tell if other sites are hosted on a particular IP.

You can be sure that over a C Class, there will be 255 IP's on it, and unless it is new, it would probably have a few domains on it.

Pleasurepays

worst ninja ever

beta-tester

that is not class C.

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beta-tester

I recommend reading:

http://en.wikipedia.org/wiki/Classful_network
and
http://www.webopedia.com/TERM/C/Class_C_network.html

To everyone who thinks aaa.bbb.CCC.ddd CCC is C class ip address

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d-null

I interpreted his rather minimally worded question a little differently, and he is going to have to come back and let us know exactly what theheck he was trying to ask....

but I think he is asking 'how can I run a bulk check on a bunch of domains to see if any of them share a common class c'

not sure if he is looking for a step by step on how to run one of the many whois sites on the net to find out the ip that a domain is hosted on and write them down to compare them by hand or if he is looking for some kind of script to be written to do the check in bulk for him....

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baddog

What is it then?

You definitely read between the lines and fill in the blanks.

d-null

and on beta tester's correct comment, I think there is a bit of a different take on the concept of 'different class c' when talking seo than the strict class designations he is talking about

there is no official comment from google on it anyways, but it has grown from the belief that a site performs better in the serps if the links it shares are from domains on different ip's, and it has been said that even sequential ip's may not be seen as 'separated sites' by google's algorithms... so I think when most seo people talk about "different class c's", they just mean ip's that are not closely designated, ie. aaa.bbb.CCC.ddd, although that is obviously not the proper definition of 'class c' in which different class c's could be sequential

that is my take on it anyways, feel free to add to it or argue the issue

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Wang Dong

so if on cheap shared host, is it possible that my ip (not just c class, the whole) is shared by many many other sites? and if so, how does that influence SEO?

baddog

You can be relatively confident that if you are paying $4.95 a month you have a shared IP.

As far as the value of a dedicated IP is concerned, Bruce Clay (very respected SEO guru) observed that although only 3 percent of websites are on dedicated IPs, well over 90 percent of the top-50 results in the search engines are sites having dedicated IP numbers. They confirmed this by moving a site from a shared IP to a dedicated IP and noticed ?significant ranking increases.?

Additionally, if you share an IP with an unseemly website owner you run the risk of having the entire IP banned, instantly losing your search credibility. And some hosts will put upwards of 9,000 different domains on one IP.

Wang Dong

it is a good answer

moeloubani

As a scientific type of guy I can always appreciate the results of an experiment like that

Thanks for the info!

Zoose

I remember reading that article YEARS ago.. I wonder if it still holds true. I know penisbot.com and wetplace.com are both on the same IP, transparently interlinked, and both do extremely well in the search engines. Obviously there's a ton of other factors that influence serps..

NinjaSteve

Sorry for the confusion, my post wasn't the greatest and I was in a bit of a rush and I was just looking at domains and IPs for a while so I said IP instead of domain in my title.

I was curious if there's a way to check many domains at one time (bulk checker) to determine if multiple domains are on the same or different Class C IPs.

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baddog

Well, I remember how his eyes lit up when I told him we did not share IP's.

Also, there was a recent blog entry made on his site where the author cited that quote, so I am guessing it still helps.

But yes, there may be another factor or two that figures into the equation.

nico-t

baddog

Good link. Forgot about it.

rowan

Technically referring to each "block of 256 IPs" as a class C isn't correct, but these days it seems to be pretty much accepted as convention in SEO...

BTW baddog, in theory you could have the full 256 IPs per xxx.xxx.xxx.* block; with classless allocations you can use .0 and .255 as normal IPs.