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
-
Automatically Check List of Sites For Links To Specific Domain
Hi all, Can anyone recommend a tool that will allow me to put in a list of about 200 domains that are then checked for a link back to a specific domain? I know I can do various link searches and use Google site: command on a site by site basis, but it would be much quicker if there was a tool that could take the list of domains I am expecting a link on and then find if that link exists and if so on what page etc. Hope this makes sense otherwise I have to spend a day doing it by hand - not fun! Thanks,
Moz Pro | | MrFrisbee
charles.0 -
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 -
Count of Inbound Internal Links
Is there a simple way, using the moz tools, to get a count of inbound internal links for a given URL? Seems simple enough but I'm having trouble finding that specific data point.
Moz Pro | | tvfoodmaps0 -
I'm looking for good outbound link profiling tool...
Hello all, Just a brief question... does anybody know of a good link profiling tool which will give me a list of URLs that are linked to from a specific website? Essentially, I'm looking for the polar opposite of OpenSiteExplorer as I'm not interested in the inbound links, only the outbound links. Thanks, Elias
Moz Pro | | A_Q0 -
On page links tool here at Seomoz
Hi Seomoz - first of all, thanks for the best SEO tools I have ever worked with (this is my first question in this forum, and also I just subscribed as a paying customer after the 30 days trial you guys offer). My question: After having worked for several weeks on getting the numbers of links in our forum on www.texaspoker.dk down, we are somewhat surprised to see that we didn't succeed in getting lower numbers. For instance, this page: http://www.texaspoker.dk/forum/aktuelle-konkurrencer/coaching-projekt-bliver-du-den-udvalgte has (that's what Seomoz seo tool tells us): 239 on page links. Can this really be true? We can't find these links, and we actuually did a lot to lower the numbers of links, for instance the forum members picture was a link before, and also there was a "go to top" link in each post in the forum. Thanks a lot.
Moz Pro | | MPO0 -
Open Site Explorer - SEO - Company Back Links not visible?
Hi Guys, I am relatively new to the SEO community and have what is hopefully a pretty quick and simple question? I have recently outsourced some of my SEO campaigns to an Australian SEO group which were referred to me buy a friend, and i do not have the time to manage all sites SEO. On pitch the SEO company said they had in excess of 7000 domains, and they would implement a massive back linking strategy for me anywhere upwards of 200 links a month and all legit. Initially there were some basic header and title tag changes needed on the site, and I am now in month 4 of my campaign. Looking forward to using SEOMOZ service and specifically Open Site Explorer, I entered my URL but to my disappointment I could only see 4 links and two I was responsible for. I spoke to the SEO company who responded Open Site Explorer wasn't a good indication of back links and that a lot of their sites were not on the network because of the structure of their linking being only one way. I would appreciate a second opinion (external of this company) on this because of my short time learning and dabbling with SEO. On a side note thoroughly enjoying learning SEO and my journey as part of the SEOMOZ community. Appreciate any feedback or responses I get. Kind regards Bodie http://www.berkeleyriver.com.au
Moz Pro | | Bodie0 -
Too Many On-Page Links: Crawl Diag vs On-Page
I've got a site I'm optimizing that has thousands of 'too many links on-page' warnings from the SeoMoz crawl diagnostic. I've been in there and realized that there are indeed, the rent is too damned high, and it's due to a header/left/footer category menu that's repeating itself. So I changed these links to NoFollow, cutting my total links by about 50 per page. I was too impatient to wait for a new crawl, so I used the On Page Reports to see if anything would come up on the Internal Link Count/External Link Count factors, and nothing did. However, the crawl (eventually) came back with the same warning. I looked at the link Count in the crawl details, and realized that it's basically counting every single '<a href'="" on="" the="" page.="" because="" of="" this,="" i="" guess="" my="" questions="" are="" twofold:<="" p=""></a> <a href'="" on="" the="" page.="" because="" of="" this,="" i="" guess="" my="" questions="" are="" twofold:<="" p="">1. Is no-follow a valid strategy to reduce link count for a page? (Obviously not for SeoMoz crawler, but for Google)</a> <a href'="" on="" the="" page.="" because="" of="" this,="" i="" guess="" my="" questions="" are="" twofold:<="" p="">2. What metric does the On-Page Report use to determine if there are too many Internal/External links? Apologies if this has been asked, the search didn't seem to come up with anything specific to this.</a>
Moz Pro | | icecarats0 -
Internal Links
Hi Just wondering if anyone can shed some light on the internal links metric in the Linkscape report. I have run the report for a number of sites that I know have internal links in them but often get the result of just 1 internal link when I run the Linkscape report and I am not sure why Thanks
Moz Pro | | UE-Web0