• BBgmoro

        See all notifications

        Skip to content
        Moz logo Menu open Menu close
        • Products
          • Moz Pro
          • Moz Pro Home
          • Moz Local
          • Moz Local Home
          • STAT
          • Moz API
          • Moz API Home
          • Compare SEO Products
          • Moz Data
        • Free SEO Tools
          • Domain Analysis
          • Keyword Explorer
          • Link Explorer
          • Competitive Research
          • MozBar
          • More Free SEO Tools
        • Learn SEO
          • Beginner's Guide to SEO
          • SEO Learning Center
          • Moz Academy
          • MozCon
          • Webinars, Whitepapers, & Guides
        • Blog
        • Why Moz
          • Digital Marketers
          • Agency Solutions
          • Enterprise Solutions
          • Small Business Solutions
          • The Moz Story
          • New Releases
        • Log in
        • Log out
        • Products
          • Moz Pro

            Your all-in-one suite of SEO essentials.

          • Moz Local

            Raise your local SEO visibility with complete local SEO management.

          • STAT

            SERP tracking and analytics for enterprise SEO experts.

          • Moz API

            Power your SEO with our index of over 44 trillion links.

          • Compare SEO Products

            See which Moz SEO solution best meets your business needs.

          • Moz Data

            Power your SEO strategy & AI models with custom data solutions.

          Turn SEO data into actionable content briefs

          Turn SEO data into actionable content briefs

          Learn more
        • Free SEO Tools
          • Domain Analysis

            Get top competitive SEO metrics like DA, top pages and more.

          • Keyword Explorer

            Find traffic-driving keywords with our 1.25 billion+ keyword index.

          • Link Explorer

            Explore over 40 trillion links for powerful backlink data.

          • Competitive Research

            Uncover valuable insights on your organic search competitors.

          • MozBar

            See top SEO metrics for free as you browse the web.

          • More Free SEO Tools

            Explore all the free SEO tools Moz has to offer.

          Let your business shine with Listings AI

          Let your business shine with Listings AI

          Get found
        • Learn SEO
          • Beginner's Guide to SEO

            The #1 most popular introduction to SEO, trusted by millions.

          • SEO Learning Center

            Broaden your knowledge with SEO resources for all skill levels.

          • On-Demand Webinars

            Learn modern SEO best practices from industry experts.

          • How-To Guides

            Step-by-step guides to search success from the authority on SEO.

          • Moz Academy

            Upskill and get certified with on-demand courses & certifications.

          • MozCon

            Save on Early Bird tickets and join us in London or New York City

          Access 20 years of data with flexible pricing
          Moz API

          Access 20 years of data with flexible pricing

          Find your plan
        • Blog
        • Why Moz
          • Digital Marketers

            Simplify SEO tasks to save time and grow your traffic.

          • Small Business Solutions

            Uncover insights to make smarter marketing decisions in less time.

          • Agency Solutions

            Earn & keep valuable clients with unparalleled data & insights.

          • Enterprise Solutions

            Gain a competitive edge in the ever-changing world of search.

          • The Moz Story

            Moz was the first & remains the most trusted SEO company.

          • New Releases

            Get the scoop on the latest and greatest from Moz.

          Surface actionable competitive intel
          New Feature

          Surface actionable competitive intel

          Learn More
        • Log in
          • Moz Pro
          • Moz Local
          • Moz Local Dashboard
          • Moz API
          • Moz API Dashboard
          • Moz Academy
        • Avatar
          • Moz Home
          • Notifications
          • Account & Billing
          • Manage Users
          • Community Profile
          • My Q&A
          • My Videos
          • Log Out

        The Moz Q&A Forum

        • Forum
        • Questions
        • My Q&A
        • Users
        • Ask the Community

        Welcome to the Q&A Forum

        Browse the forum for helpful insights and fresh discussions about all things SEO.

        1. Home
        2. SEO Tactics
        3. Intermediate & Advanced SEO
        4. Why some domains and sub-domains have same DA, but some others don't?

        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?

        Intermediate & Advanced SEO
        3
        3
        1684
        Loading More Posts
        • Watching

          Notify me of new replies.
          Show question in unread.

        • Not Watching

          Do not notify me of new replies.
          Show question in unread if category is not ignored.

        • Ignoring

          Do not notify me of new replies.
          Do not show question in unread.

        • Oldest to Newest
        • Newest to Oldest
        • Most Votes
        Reply
        • Reply as question
        Locked
        This topic has been deleted. Only users with question management privileges can see it.
        • rayatarh545123
          rayatarh545123 last edited by

          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.

          1 Reply Last reply Reply Quote 0
          • dave.kudera
            dave.kudera Staff last edited by

            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.

            1 Reply Last reply Reply Quote 0
            • effectdigital
              effectdigital last edited by

              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

              1 Reply Last reply Reply Quote 2
              • 1 / 1
              • First post
                Last post

              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.

              • See all categories

              Related Questions

              • anagentile

                Redirection of 100 domain to Main domain affects SEO?

                domain seo redirecting domain

                Hi guys, An email software vendor managed by a different area of my company redirected 100 domains used for unsolicited email campaigns to my main domain. These domains are very likely to get blacklisted at some point. My SEO tool now is showing me all those domains as "linking" to my main site as do-follow links. The vendor states that this will not affect my main domain/website in any way. I'm highly concerned. I would appreciate your professional opinion about this. Thanks!!

                Intermediate & Advanced SEO | | anagentile
                0
              • Citimarine

                Why isn't our complete meta title showing up in the Google SERPS? (cut off half way)

                We carry a product line, cutless bearings (for use on boats). For instance, we have one, called the Able, that has the following meta title (and searched by View Page Source to confirm): BOOT 1-3/8" x 2-3/8" x 5-1/2" Johnson Cutless Bearing | BOOT Cutlass However, if I search for it on on Google by part number or name (boot cutless bearing, boot cutlass bearing), the meta title comes back with whole first part chopped off, only showing this : "x 5-1/2" Johnson Cutless Bearing | BOOT Cutlass - Citimarine ..." Any idea why? Here's the url if it will hopefully help: https://citimarinestore.com/en/metallic-inches/156-boot-johnson-cutless-bearing-870352103.html All the products in the category are doing the same. Thanks!

                Intermediate & Advanced SEO | | Citimarine
                0
              • SS.Digital

                Forwarded vanity domains, suddenly resolving to 404 with appended URL's ending in random 5 characters

                We have several vanity domains that forward to various pages on our primary domain.
                e.g. www.vanity.com (301)--> www.mydomain.com/sub-page (200) These forwards have been in place for months or even years and have worked fine.  As of yesterday, we have seen the following problem.  We have made no changes in the forwarding settings. Now, inconsistently, they sometimes resolve and sometimes they do not.  When we load the vanity URL with Chrome Dev Tools (Network Pane) open, it shows the following redirect chains, where xxxxx represents a random 5 character string of lower and upper case letters.  (e.g. VGuTD) EXAMPLE:
                www.vanity.com                                  (302, Found) -->
                www.vanity.com/xxxxx                        (302, Found) -->
                www.vanity.com/xxxxx                        (302, Found) -->
                www.vanity.com/xxxxx/xxxxx               (302, Found) -->
                www.mydomain.com/sub-page/xxxxx (404, Not Found) This is just one example, the amount of redirects, vary wildly.  Sometimes there is only 1 redirect, sometimes there are as many as 5. Sometimes the request will ultimately resolve on the correct mydomain.com/sub-page, but usually it does not (as in the example above). We have cross-checked across every browser, device, private/non-private, cookies cleared, on and off of our network etc...   This leads us to believe that it is not at the device or host level. Our Registrar is Godaddy.  They have not encountered this issue before, and have no idea what this 5 character string is from.  I tend to believe them because per our analytics, we have determined that this problem only started yesterday. Our primary question is, has anybody else encountered this problem either in the last couple days, or at any time in the past?  We have come up with a solution that works to alleviate the problem, but to implement it across hundreds of vanity domains will take us an inordinate amount of time.  Really hoping to fix the cause of the problem instead of just treating the symptom.

                Intermediate & Advanced SEO | | SS.Digital
                0
              • SEOhmygod

                Does content revealed by a 'show more' button get crawled by Google?

                I have a div on my website with around 500 words of unique content in, automatically when the page is first visited the div has a fixed height of 100px, showing a couple of hundred words and fading out to white, with a show more button, which when clicked, increases the height to show the full content. My question is, does Google crawl the content in that div when it renders the page? Or disregard it? Its all in the source code. Or worse, do they consider this cloaking or hidden content? It is only there to make the site more useable for customers, so i don't want to get penalised for it. Cheers

                Intermediate & Advanced SEO | | SEOhmygod
                0
              • RickyShockley

                Buying Expired Domains with Decent DA/PA for SEO Purposes

                Hey guys, i've seen some stuff about this before but I recently found an opportunity to put it into action and wanted to make sure I knew what I was getting into! I am looking at buying a domain (expired and now only 10 dollars) that has a decent domain authority and has some keywords in it related to my clients practice. I plan on using a 301 redirect to pass "link juice" because this client is looking for a quick bump in rankings. Thoughts? Benefits? Problems with this?

                Intermediate & Advanced SEO | | RickyShockley
                1
              • knielsen

                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 | | knielsen
                1
              • SeoSheikh

                Should I buy a .co domain if my preferred .com and .co.uk domain are taken by other companies?

                I'm looking to boost my website ranking and drive more traffic to it using a keyword rich domain name. I want to have my nearest city followed by the keyword "seo" in the domain name but the .co.uk and .com have already been taken. Should I take the plunge and buy .co at a higher price? What options do I have? Also whilst we're on domains and URL's is it best to separate keywords in url's with a (_) or a (-)? Many thanks for any help with this matter. Alex

                Intermediate & Advanced SEO | | SeoSheikh
                0
              • WEB-IRS

                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-IRS
                0

              Get started with Moz Pro!

              Unlock the power of advanced SEO tools and data-driven insights.

              Start my free trial
              Products
              • Moz Pro
              • Moz Local
              • Moz API
              • Moz Data
              • STAT
              • Product Updates
              Moz Solutions
              • SMB Solutions
              • Agency Solutions
              • Enterprise Solutions
              • Digital Marketers
              Free SEO Tools
              • Domain Authority Checker
              • Link Explorer
              • Keyword Explorer
              • Competitive Research
              • Brand Authority Checker
              • Local Citation Checker
              • MozBar Extension
              • MozCast
              Resources
              • Blog
              • SEO Learning Center
              • Help Hub
              • Beginner's Guide to SEO
              • How-to Guides
              • Moz Academy
              • API Docs
              About Moz
              • About
              • Team
              • Careers
              • Contact
              Why Moz
              • Case Studies
              • Testimonials
              Get Involved
              • Become an Affiliate
              • MozCon
              • Webinars
              • Practical Marketer Series
              • MozPod
              Connect with us

              Contact the Help team

              Join our newsletter
              Moz logo
              © 2021 - 2026 SEOMoz, Inc., a Ziff Davis company. All rights reserved. Moz is a registered trademark of SEOMoz, Inc.
              • Accessibility
              • Terms of Use
              • Privacy

              Looks like your connection to Moz was lost, please wait while we try to reconnect.