Moz Q&A is closed.
After more than 13 years, and tens of thousands of questions, Moz Q&A closed on 12th December 2024. Whilst we’re not completely removing the content - many posts will still be possible to view - we have locked both new posts and new replies. More details here.
Why some domains and sub-domains have same DA, but some others don't?
-
Hi
I noticed for some blog providers in my country, which provide a sub-domian address for their blogs. the sub-domain authority is exactly as the main domain. Whereas, for some other blog providers every subdomain has its different and lower authority.
for example "ffff.blog.ir" and "blog.ir" both have domain authority of 60. It noteworthy to mention that the "ffff.blog.ir" does not even exist!
This is while mihanblog.com and hfilm.mihanblog.com has diffrent page authority.
-
Hey!
DA scores are specific to the root domain, we are not taking into account a subdomain. So even if you search a subdomain that doesn't exist (ffff.blog.ir), DA score is still only relevant to the root domain (blog.ir) which does exist.
Page Authority on the other hand is specific to the exact page you are searching, so it makes sense that mihanblog.com and hfilm.mihanblog.com would have different page authority scores are they are separate pages.
Hope that helps, let me know if you have further questions.
-
Am pretty sure that Moz just unifies DA stats in some circumstances when they have no 'actual' data for the subdomain in question. Sites which are very important, which have a number of sub-domains (but not hundreds or thousands) often render different results for DA metrics. For some blog platforms (blogger is a good example, also "blogname.wordpress.com" WordPress hosted blogs) - they have thousands or hundreds of thousands of sub-domains and Moz can't index all of them
In these situations, if Moz comes across a subdomain which is well-linked across the web it will separate it out and ascribe unique values. For the rest (of which Moz holds no data), it probably just unifies the DA metric with the root domain
It's a symptom of an incomplete index of the web. That being said, no one has a complete index of the web - you have to work with what you got
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
-
Google doesn't index image slideshow
Hi, My articles are indexed and images (full size) via a meta in the body also. But, the images in the slideshow are not indexed, have you any idea? A problem with the JS Example : http://www.parismatch.com/People/Television/Sport-a-la-tele-les-femmes-a-l-abordage-962989 Thank you in advance Julien
Intermediate & Advanced SEO | | Julien.Ferras0 -
Will disallowing URL's in the robots.txt file stop those URL's being indexed by Google
I found a lot of duplicate title tags showing in Google Webmaster Tools. When I visited the URL's that these duplicates belonged to, I found that they were just images from a gallery that we didn't particularly want Google to index. There is no benefit to the end user in these image pages being indexed in Google. Our developer has told us that these urls are created by a module and are not "real" pages in the CMS. They would like to add the following to our robots.txt file Disallow: /catalog/product/gallery/ QUESTION: If the these pages are already indexed by Google, will this adjustment to the robots.txt file help to remove the pages from the index? We don't want these pages to be found.
Intermediate & Advanced SEO | | andyheath0 -
Duplicate Content through 'Gclid'
Hello, We've had the known problem of duplicate content through the gclid parameter caused by Google Adwords. As per Google's recommendation - we added the canonical tag to every page on our site so when the bot came to each page they would go 'Ah-ha, this is the original page'. We also added the paramter to the URL parameters in Google Wemaster Tools. However, now it seems as though a canonical is automatically been given to these newly created gclid pages; below https://www.google.com.au/search?espv=2&q=site%3Awww.mypetwarehouse.com.au+inurl%3Agclid&oq=site%3A&gs_l=serp.3.0.35i39l2j0i67l4j0i10j0i67j0j0i131.58677.61871.0.63823.11.8.3.0.0.0.208.930.0j3j2.5.0....0...1c.1.64.serp..8.3.419.nUJod6dYZmI Therefore these new pages are now being indexed, causing duplicate content. Does anyone have any idea about what to do in this situation? Thanks, Stephen.
Intermediate & Advanced SEO | | MyPetWarehouse0 -
Should I redirect my Google Update Effected Domain to brand new Domain?
Hey Moz experts, I had a domain which was really doing better but after the Humming Bird update my traffic was decreased up to 90%. There are plenty of posts on my existing blog, Now what should I do? I mean should I redirect it to a brand new domain or Copy all the posts to a brand new domain and delete my existing domain? Note that the Old domain has PR1, DA 19 and PA 30.
Intermediate & Advanced SEO | | imran20780 -
Best way to block a sub-domain from being indexed
Hello, The search engines have indexed a sub-domain I did not want indexed its on old.domain.com and dev.domain.com - I was going to password them but is there a best practice way to block them. My main domain default robots.txt says :- Sitemap: http://www.domain.com/sitemap.xml global User-agent: *
Intermediate & Advanced SEO | | JohnW-UK
Disallow: /cgi-bin/
Disallow: /wp-admin/
Disallow: /wp-includes/
Disallow: /wp-content/plugins/
Disallow: /wp-content/cache/
Disallow: /wp-content/themes/
Disallow: /trackback/
Disallow: /feed/
Disallow: /comments/
Disallow: /category//
Disallow: */trackback/
Disallow: */feed/
Disallow: /comments/
Disallow: /?0 -
Redirect ruined domain to new domain without passing link juice
A new client has a domain which has been hammered by bad links, updates etc and it's basically on its arse because of previous SEO guys. They have various domains for their business (brand.com, brand.co.uk) and want to use a fresh domain and take it from there. Their current domain is brand.com (the ruined one). They're not bothered about the rankings for brand.com but they want to redirect brand.com to brand.co.uk so that previous clients can find them easily. Would a 302 redirect work for this? I don't want to set up a 301 redirect as I don't want any of the crappy links pointing across. Thanks!
Intermediate & Advanced SEO | | jasonwdexter0 -
SEO value in multiple backlinks from same domain and from various sub-domains.
A site has a link to my site as one of their main tabs, which means whenever a user clicks through to another page within the site, my link - being a main tab - is there. This creates thousands of links from this site. How does Google treat this? Do we have a rough formula estimate. In other words, assume it creates 1,000 backlinks would the SEO value be around the same as if I had just 2 link total as a main tab, but on 2 different non-related sites? Or, does it actually count fully as 1,000 links? Links from various sub-domains. Several .EDU's are linking to my site. Different schools within the overall same university. Example: nursing.abc.edu links to my site, but so does business.abc.edu. For SEO does that count as much as if I had links from complete non-related universities, or would Google evaluate that these links are related (since same main domain) and that will discount any links more than 1 to some extent? If discounted, then what do we estimate the discount to be? thank yoyu
Intermediate & Advanced SEO | | knielsen1 -
Include Cross Domain Canonical URL's in Sitemap - Yes or No?
I have several sites that have cross domain canonical tags setup on similar pages. I am unsure if these pages that are canonicalized to a different domain should be included in the sitemap. My first thought is no, because I should only include pages in the sitemap that I want indexed. On the other hand, if I include ALL pages on my site in the sitemap, once Google gets to a page that has a cross domain canonical tag, I'm assuming it will just note that and determine if the canonicalized page is the better version. I have yet to see any errors in GWT about this. I have seen errors where I included a 301 redirect in my sitemap file. I suspect its ok, but to me, it seems that Google would rather not find these URL's in a sitemap, have to crawl them time and time again to determine if they are the best page, even though I'm indicating that this page has a similar page that I'd rather have indexed.
Intermediate & Advanced SEO | | WEB-IRS0