Link Blocks
-
Sorry, perhaps a noob question.
In relation to site explorer, have also searched and unable to find any information, wondered if anyone could advise as to what "Linking C Blocks" are? Found under the "Compare Link Metrics" tab.
Thanks in advance.
Lee
-
Ok, better now
Well, it seems a good link profile:
you have 240 linking root domain and 192 of them are from different c-blocks and of those 240 root domains 205 are followed.
-
no problem, tbh I struggled a bit writing the question :)) See attached though, much appreciated.
-
I doubt it, there are 254 ips in a c-block, but there is 65,000 in a B and 16,000,000 in a A.
Now considereing that 1 ip number can have thousonds of websites, such as discountASP hosting. the chance of gettiing a link from the same B or A are very high, exspecialy in teh same city.
I believe that the whole c-block thnk is over blown for these reasons
discountASP is a huge hosting company, yet they run all website on one IP number.
You can in theroy have 14 billion ip numbers on your network using nat translations with only one external ip number, using host headers the number is infinate.So while I beleve that SE's take c-blocks into account, i dont think its too much of a problem unless you have a high percentage.
I have this problem because i build and host sites myself. so its of limited use my putting my link on each one, infact it could be harmfull.
I wonder if google takes this in to account, that many like me that develop websites and host them have this problem.
-
On a SEO perspective, right now they do not seems correlated to better rankings. Honestly the best person to answer your question should be Rand himself, as he is surely more expert than me on this "correlation" thing
-
I would not think to blocks as a discriminant in passing more or less link juice, simply I will take them into account as an ever better way for Google to understand if a site is really "popular" or not.
- No links = site totally ignored by the users
- Links but poor unique root domains diversification = poor popularity and maybe spam based links
- Links and great number of unique root domains but por C-Blocks diversification = good popularity, but maybe based on sites's network
- Links and great number of unique root domains and good diversification of C-Block = good popularity and more probably based on natural link building (even though manipulative actions cannot be excluded)
There's then the case of a site that has few links from a not too big unique domains names on different C-Blocks. I saw cases that this kind of sites can compete well against the third case I've listed above.
About your last question, just with your words i cannot understand it well. May you add a snapshot of what are you seeing?
-
What a well presented, excellent answer. Are the A blocks and B blocks ever relevant in a way similar to that of the C block being same host?
Thanks Gianluca
-
Ah, many thanks to you both
would I be right in assuming links from the same C Block would pass less juice or would none be passed?
Also just to clarify, the figure in site explorer shows 192 what is this telling me? Not sure if this is what it is describing but the figure for "Total Linking Root Domains" is 240.
lol sorry, so many questions
-
Gian is pretty much right. Linking C blocks is a useful metric to know. Websites on the same C-block IP address are likely owned by the same person/company and will give less weight.
For best results your linking c-blocks should be as close to your linking root domains as possible. Diversity is the key. Otherwise you could just buy 1000 root domains, host them on the same server space for very little cost and dominate the search results.
-
There's an old great answer to your question in the Search Engine Forum. I copy it here:
A "C" Block address is based on your IP. In general, webhosts are given a different class C, so if you have a different C block, you are usually talking about two different webhosts.
I'm talking about the actual hardware owners here, of course. If two resellers of the same host sell you two hosting accounts, there is a good chance they are both on the same Class C.
Google assumes that sites hosted by two different hosts are probably separate, and therefore links between sites hosted on them are more likely to be from different people. There are problems with that assumption, but it's one of the things they look at anyway (gotta look at something).
Let's say you had an account with a shared IP address. So, for example, you had two sites that both used 192.168.5.1 as an IP. Google would tend to assume that these two sites are related, since they are on the same IP. This can be an issue with free or cheap hosts, which may have thousands of websites hosted on the same shared IP. You would normally try to avoid this if you had multiple sites that were likely to link to each other.
Now let's say that you got yourself 2 different (static) IP - your host would probably give you 192.168.5.2 and 192.168.5.3, in this example. Well these are two different IP's all right, but they are right next to each other, aren't they? Google would also likely consider these to be related.
But what if you hosted with another site across town? Perhaps they would be assigned a group of IP's to hand out that look like 192.168.122.XXX. Well, that 122 now indicates a different ISP, and therefore two sites hosted at this level are more likely to be considered unrelated.
To make a long story short:
192.168.006.001
is a standard, fully qualified IP address. The blocks in this case are:
AAA.BBB.CCC.001-254
That's not a Typo - Class D and E look totally different. The last 3 digits are actually called the Rest Field
So these are within the same class
192.168.222.111
192.168.222.230And these are different Class C IP's:
192.167.111.233
192.168.222.233I quote just part of the post, as part of is related to a specific issue. You can read it here: http://forums.searchenginewatch.com/showthread.php?t=14838
Got a burning SEO question?
Subscribe to Moz Pro to gain full access to Q&A, answer questions, and ask your own.
Browse Questions
Explore more categories
-
Moz Tools
Chat with the community about the Moz tools.
-
SEO Tactics
Discuss the SEO process with fellow marketers
-
Community
Discuss industry events, jobs, and news!
-
Digital Marketing
Chat about tactics outside of SEO
-
Research & Trends
Dive into research and trends in the search industry.
-
Support
Connect on product support and feature requests.
Related Questions
-
Sudden increase in on-page links
Within one week, the site crawl shows my on-page links going from ~10 to ~100+ Does anyone know of a rational reason for this? Sucuri shows my site is clean, so I don't think it's a hack. 10 seems too low to begin with anyway. Any ideas? Thanks 🙂
Moz Pro | | pupstar0 -
Need help locating a 404 link
My reports are showing a 404 error for a link to a page in our WP site for which we changed the URL months ago. I can't find where the link is coming from. I used Screaming Frog, but can't find where it might tell me the origin of the link, only that it exists. I am pretty sure it's internal. Can someone please tell me how to find the originating page so I can remove the link without having to comb through every page of the site to look for it? Thanks!
Moz Pro | | gfiedel0 -
How can i locate the links on my site that are causing 404 errors?
In the 404 error report, there is no way to find what page on my site has the broken link.. how can i find them??? help. Matt
Moz Pro | | seo4anyone0 -
Sudden, drastic drop in # of links and root domains on website?
Noticed that my links and root domain numbers had dropped by ~40%, seemingly overnight. Any idea what could have contributed to this (Toolbar update???)?
Moz Pro | | wlefevre0 -
Why would opensite explorer show a link from baidu result page with baidu as a linking root domain?
I found an old domain that has very high domain authority and one of its top linking root domains is baidu I clicked the link in ose and it took me to a baidu serp????? please explain...im happy to clarify if need be or give you the site in question just let me know what you think. I checked ose for the page authority of the serp page it was 50. would that page be helping the site in question to rank? or am I just dumb for asking this question One more thing I couldnt actually find a link to the page I was looking at in ose on the baidu result page.. thanks
Moz Pro | | duncan2740 -
Why is Followed Linking Root Domains higher than External Followed Links?
Surely there must be at least one external link for each linking root domain? Some results for smaller sites give a higher number of domains linking in than incoming links - e.g. www.forbesandsawyer.co.uk Under Subdomain metrics: External Followed Links - 1 Followed Linking Root Domains - 2 Surely 2 root domains would mean AT LEAST 2 external followed links? Thanks, Andrew
Moz Pro | | Silktide0 -
Broken Links and Duplicate Content Errors?
Hello everybody, I’m new to SEOmoz and I have a few quick questions regarding my error reports: In the past, I have used IIS as a tool to uncover broken links and it has revealed a large amount of varying types of "broken links" on our sites. For example, some of them were links on my site that went to external sites that were no longer available, others were missing images in my CSS and JS files. According to my campaign in SEOmoz, however, my site has zero broken links (4XX). Can anyone tell me why the IIS errors don’t show up in my SEOmoz report, and which of these two reports I should really be concerned about (for SEO purposes)? 2. Also in the "errors" section, I have many duplicate page titles and duplicate page content errors. Many of these "duplicate" content reports are actually showing the same page more than once. For example, the report says that "http://www.cylc.org/" has the same content as "http://www.cylc.org/index.cfm" and that, of course, is because they are the same page. What is the best practice for handling these duplicate errors--can anyone recommend an easy fix for this?
Moz Pro | | EnvisionEMI0 -
How are our competitors getting these inbound linking domains?
I'm currently managing SEO for my company's website, and I'm getting into link building for the first time. As part of the process, I'm using Open Site Explorer to see who's linking into our competitor sites, to get a better sense of what's available to us in our particular avenue of e-commerce. However, I'm finding that our competitors are getting inbound links from high-authority sites pretty far afield from selling jewelry - census.gov, parallels.com, warnerbros.com, and others. I try clicking through to these links, but each link starts a download of a file. I've seen .f4v, .7z, and .apk files listed as inbound links to our competitor. How is this happening? Again, I'm new to link building, so there may be a simple answer here, and if so I apologize for asking. However, this seems really strange to me, and a difficult situation to confront.
Moz Pro | | jozaksut0