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
-
Will moz crawl pages blocked by robots.txt and nofollow links?
i have over 2,000 temporary redirects in my campaign report redirects are mostly events like being redirected to a login page before showing the actual data im thinking of adding nofollow on the link so moz wont crawl the redirection to reduce the notification will this solve my problem?
Moz Pro | | WizardOfMoz0 -
OK I'll try again.... Linking root domains and external links
I'm new to the crawl test tool, I think I know what is meant by external links and linking root domains but I need to check. If there are 500 external links and 50 linking root domains does that suggest the essentially those 500 links are coming from 50 root domains? If yes, then what would 1000 linking root domains and 100 links mean? Or am I completely wrong in my assumptions and if so, can somebody point me in the right direction? Thank you.
Moz Pro | | JemRobinson0 -
MozTrust suddenly dropped to zero. Link data now unavailable???
I'm running an SEOMoz campaign for a small site to monitor some tweaks I've made and testing new things out. Over a year or so the changes were great - organic traffic was rising, domain metrics were too. Then in October 2012 domain trust, Moztrust and all other link metrics went to zero. There's no data in OSE for this particular small site and as far as I can tell, no impact on search. The limited number of inbound links all appear to be intact and there's no reason why the site would be hit by Panda/Penguin style updates. Why has this sudden loss of data occurred? Is the site no longer in SEOMoz's databases? Without any link data it's difficult to tell why this has happened. If it is no longer in the Moz database, how do I get it back - that data was useful!
Moz Pro | | StevieCC0 -
Issue Using MozScape wtih SEOGadet's Link Excel Extension
Howdy Everyone! Since i've seen the MozCon presentation by Richard Baxter at SEOGadget, i've been completely amazed by the links extension for Excel. I tried this morning to give it a try. Unfortunately, I cannot get it working, and was hoping that someone here could help me out. I know it's out of the usual "realm" of questions, but I figure it's worth a try 🙂 I successfully installed the addon and entered my Access id (as "member-xxxxxxxxxx" member is in my id) and the secret key. I then downloaded the "OSE" excel spreadsheet" just to make sure I get all the calls right (as I know the doc works) Once I do this, and enter anything in, I get the "an error occured: the remote server returend an error: 401 unauthorized. I then went into the config file (as the setup doc suggests) and disabled run time caching (or at least set "SEOMOZ_API_use_cache_YN":"N") and the SEOMOZ_API_timeout to 100000 from 60000. I have also tried uninstalling and reinstalling the addin, along with regenerating the MozScape API Key Anyway, i'm not an excel wiz, and would appreciate any help that I could get on this. I'm also about to experiment with SEO Tools For Excel if anywone wants to check that out. Thanks in advance Zach Russell
Moz Pro | | Zachary_Russell0 -
Are organic site links excluded in the rankings report?
If I'm pulling a rankings report for a specific subdomain and a different subdomain appears at the main result and the specific subdomain is a site link beneath it, does that show up in the results? It doesn't seem to in my report.
Moz Pro | | mattiasantin0 -
Does Google have a direct link with facebook and twitter?
Google monitor social media. What I'm wondering is do Google use the same tools we have on Facebook's API, Twitter's API etc to use in their SERPs Or do Facebook grant Google more detailed access to see who has liked links etc. I think it's quite an interesting point as surely I can push up my own count by repeatedly sharing my own links, which wouldn't be genuine. If Google had better access they could then determine what's been faked etc.
Moz Pro | | PhotoGazza0 -
Sites Blocking Open Site Explorer? Penguin related.
Last week I was looking at a competitors site who has a link scheme going on and I could actually check the links for each anchor text. This week they don't work at all, do you think they're blocking the rogerbot on their domains? Or is there a problem with open site explorer? http://www.opensiteexplorer.org/anchors?site=www.decks.ca If you're interested in the background, all the links are to instant-home-biz . com which then redirects decks . ca - it's a tricky technique. Pretty much all of the links are from sketchy sites like: airpr23.xelr8it.biz/ airpr23.anzaland.net/ airpr23.vacation-4-free.com/airpr23.blogfreeradio.net/airpr23.blogomatik.com/http://www.morcandirect.com/mortgages/resources2.php which I thought Penguin was supposed to catch…
Moz Pro | | BeTheBoss0 -
Local search block seems to mess up ranking calculations!
Time and time again i see SEO moz come out with a new rankings report and tell me that I've gone up or down in the rankings by 9 and I get really excited. Then i go look at the search and once agian we are in the exact same position! What it seems like is sometimes SEO Moz decides to count the local search block, and other times it decides not too. Is there any way to fix this? To make it always count the local search block would be preferred.
Moz Pro | | adriandg0