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.

      Let your business shine with Listings AI
      Moz Local

      Let your business shine with Listings AI

      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.

      NEW Keyword Suggestions by Topic
      Moz Pro

      NEW Keyword Suggestions by Topic

      Learn more
    • 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

      Unlock flexible pricing & new endpoints
      Moz API

      Unlock flexible pricing & new endpoints

      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
    • 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. Technical SEO
    4. Subdomain vs Main Domain Penalties

    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.

    Subdomain vs Main Domain Penalties

    Technical SEO
    6
    10
    6546
    Loading More Posts
    • Oldest to Newest
    • Newest to Oldest
    • Most Votes
    Reply
    • Reply as question
    Log in to reply
    This topic has been deleted. Only users with question management privileges can see it.
    • Prospector-Plastics
      Prospector-Plastics last edited by

      We have a client who's main root.com domain is currently penalized by Google, but the subdomain.root.com is appearing very well. We're stumped - any ideas why?

      1 Reply Last reply Reply Quote 0
      • Prospector-Plastics
        Prospector-Plastics @MarieHaynes last edited by

        Extremely helpful insight Marie - I will be contacting you directly soon.

        It appears that the duplicate content you've found (and other dupe content we've found) is actually our content that other sites have repurposed. Seems like Google has determined our site as the culprit, so this would be an issue we need to address - the only thought that comes to mind right away is adding an 'Author' tag, then start working on what appears to be a hefty cleanup project, something that looks like you are an expert on and will most likely be working directly with you in the near future! 🙂

        The 2nd level pages that have little content and lots of links are 'noindex,follow' but I'm nervous about the number of these tags throughout our site which could be seen as spammy to a search engine. Of note, the 2nd level page section you have found ranks quite well since it is a subdomain which is interesting. Our suspicion is that since we made the 404 (200 success) error that Google detected on Dec. 9, 2011, we have been on some sort of Google 'watch-list' and any little thing we do incorrectly that they find, we immediately are penalized.

        The homepage description of our company is reused on industry directories that we are listed on, so perhaps we must consider re-writing our description to be unique, and adding more content to the homepage would be a good thing and is certainly easily doable.

        1 Reply Last reply Reply Quote 0
        • MarieHaynes
          MarieHaynes @Prospector-Plastics last edited by

          You have some significant duplicate content issues with www.ides.com.  There is not a lot of text on your home page and what is there is duplicated in many places across the web.

          Your second level pages are all just links.  I would noindex, follow these.

          I looked at two inner pages:

          http://plastics.ides.com/generics/6/alphamethylstyrene-ams - extremely thin content

          Here is a Google search for text I copied from the styrene-acrylonitrile page.  There are 247 pages that use this opening sentence.

          My guess is that this is indeed a Panda issue.  But please know that I've only just taken a quick look so I can't say for sure.  What doesn't make sense is that your traffic drops don't happen on Panda dates which really should be the case if it was Panda.

          Panda definitely can affect just one part of a site (such as a root and not a subdomain).  I would work on making these pages completely unique and also noindexing the thin pages.

          Prospector-Plastics 1 Reply Last reply Reply Quote 1
          • Prospector-Plastics
            Prospector-Plastics @MarieHaynes last edited by

            Thank you Marie,

            We 301 redirect any traffic going to root.com to www.root.com, and any content that we moved from www.root.com to subdomain.root.com has been completely removed from www.root.com. There doesn't appear to be any duplicate content between the two. There is some duplicate content that we treat with canonicals on subdomain.root.com - very small portion of total pages (less than 1%).

            As for your other questions, no warnings in WMT. Robots txt file looks clean, canonicals are in place correctly, and no accidental non-indexing that we know of.

            Here is the actual site that might help to look at:

            http://www.ides.com
            http://plastics.ides.com/materials
            http://www.ides.com/robots.txt

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

              I think the answer here depends on whether or not you have actually been penalized and why the site is dropping out of the SERPS.  Do you have a warning in WMT?  If not, then you're probably not penalized.

              It's unlikely to be Penguin because Penguin did not refresh lately.  Similarly, Panda did not refresh on the days you mentioned.  So, it's not likely a penalty but rather some type of site structure issue.

              Is there duplicate content between the subdomain and the root?  If so, then Google will choose one as the owner and not show the other prominently.  Any issues with robots.txt?  Are the canonicals set correctly?  Any chance of accidental noindexing?

              Prospector-Plastics 1 Reply Last reply Reply Quote 1
              • Maximise
                Maximise last edited by

                Subdomains and root domains are not necessarily always owned by the same person and therefore will not always be given the same penalties. As Scott mentioned, they are seen as different sites.

                e.g. If I create a new WordPress account and create me.wordpress.com and then build a black hat site which gets penalized, this is not going to affect you.wordpress.com or  www.wordpress.com.

                1 Reply Last reply Reply Quote 0
                • Prospector-Plastics
                  Prospector-Plastics last edited by

                  Thank you all for your insight - good stuff, but still stumped.

                  Here's everything we know that might help point out why the main domain (ie www.root.com) was penalized by Google. We redirect root.com to www.root.com with a 301 redirect, and it is setup this way in Google Webmaster Tools too.

                  December 9, 2011 - the site's 404 error page was incorrectly setup as a 200, resulting in a quick bloat of 1 million plus pages. The website dropped from Google immediately. The error page was correctly setup 2 days later. The site still appeared in Google's index via site: query. However the site didn't reappear in Google's SERPs until May 2, 2012.

                  October 25, 2012 - the website again drops from Google for an unknown reason. We then moved a significant portion of content from www.root.com to subdomain.root.com. Pages from subdomain.root.com began appearing within 3 days as high they appeared previously on Google. From December 9, 2011 throughout this entire time we were correcting any errors reported in Google Webmaster Tools on a daily basis.

                  February 26, 2013 - The website yet again is dropped from Google, the subdomain.root.com continues to appear and rank well.

                  Due to moving most of the content from www.root.com to subdomain.root.com, the index for www.root.com from October 2012 dropped from 142,000 slowly to an average of 21,400 ending at today's 4,230. However this index count fluctuates greatly every few days (probably due to moving content from www.root.com to subdomain.root.com).

                  Of note, the site is NOT a content farm, but legitimate unique technical content that is hosted for hundreds of clients.

                  Again any ideas are most welcome!

                  1 Reply Last reply Reply Quote 0
                  • ScottJames13
                    ScottJames13 last edited by

                    From my understanding subdomains are considered completely separate from root domains unless you have a 301 redirect or conical that tells search engines you want them to consider the root or the subdomain to be the same; for example, http://www.yourdomain.com (subdomain) points to http://yourdomain.com

                    Therefore, you could have a subdomain out rank a root domain, or in your case a root domain penalized and the subdomain continue to rank well. The fact that they share an IP address shouldn't affect all the domains under that IP as many websites are on shared hosting which use the same IP address.

                    1 Reply Last reply Reply Quote 1
                    • AdamThompson
                      AdamThompson last edited by

                      This isn't necessarily surprising. Penalties and negative ranking algorithms can be applied at a page level, a subdomain level, a root domain level, etc.

                      For example, HubPages used subdomains to help escape from a Panda slap.

                      Another example: Google placed a manual penalty on a single page of BBC's website.

                      1 Reply Last reply Reply Quote 1
                      • jesse-landry
                        jesse-landry last edited by

                        hmmm...

                        do they point to the same IP address?

                        1 Reply Last reply Reply Quote 0
                        • 1 / 1
                        • First post
                          Last post

                        Got a burning SEO question?

                        Subscribe to Moz Pro to gain full access to Q&A, answer questions, and ask your own.


                        Start my free trial


                        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

                        • AlexSG

                          Rel canonical between mirrored domains

                          Hi all & happy new near! I'm new to SEO and could do with a spot of advice: I have a site that has several domains that mirror it (not good, I know...)  So www.site.com, www.site.edu.sg, www.othersite.com all serve up the same content.  I was planning to use rel="canonical" to avoid the duplication but I have a concern: Currently several of these mirrors rank - one, the .com ranks #1 on local google search for some useful keywords. the .edu.sg also shows up as #9 for a dirrerent page. In some cases I have multiple mirrors showing up on a specific serp. I would LIKE to rel canonical everything to the local edu.sg domain since this is most representative of the fact that the site is for a school in Singapore but...
                          -The .com is listed in DMOZ (this used to be important) and none of the volunteers there ever respoded to requests to update it to the .edu.sg
                          -The .com ranks higher than the com.sg page for non-local search so I am guessing google has some kind of algorithm to mark down obviosly local domains in other geographic locations Any opinions on this? Should I rel canonical the .com to the .edu.sg or vice versa? I appreciate any advice or opinion before I pull the trigger and end up shooting myself in the foot! Best regards from Singapore!

                          Technical SEO | | AlexSG
                          0
                        • jamesm5i

                          "Fourth-level" subdomains. Any negative impact compared with regular "third-level" subdomains?

                          Hey moz New client has a site that uses: subdomains ("third-level" stuff like location.business.com) and; "fourth-level" subdomains (location.parent.business.com) Are these fourth-level addresses at risk of being treated differently than the other subdomains? Screaming Frog, for example, doesn't return these fourth-level addresses when doing a crawl for business.com except in the External tab. But maybe I'm just configuring the crawls incorrectly. These addresses rank, but I'm worried that we're losing some link juice along the way. Any thoughts would be appreciated!

                          Technical SEO | | jamesm5i
                          0
                        • media-surfer

                          Umlaut in domain

                          Hi, My client wants to expand it's business to Germany and logically we need a domain name to match. We've found a great one and regsiterd several variants to it. However I just found out that in Germany it is possible (while here it's not) to register a domain with an umlaut. My question is: will google assign more value to: schädlinge.de than schadlinge.de when users search for schädlinge? If yes, how large will the difference be? (I will use an umlaut in the title etc) Kind regards,
                          Jason.

                          Technical SEO | | media-surfer
                          0
                        • SCFederal

                          Keep the blog separate or incorporate into main domain?

                          So my organization currently has both a main site and on a separate domain and separate host a wordpress blog.  (our own domain not a wordpress.com) the content posted on this blog is local, community driven, and related to our business but it is not used in anyway as a "sales" tool.  It's more for interaction purposes with members and employees. This blog has a lot of content and is updated with new posts very often. (generate traffic from a pretty wide variety of searches some related some not)  My plan has been to 301 the old domain and move the wordpress blog over to our root domain in a subdirectory such as oursite.com/blog. Does anyone have tips for moving a blog over like this?  I'm concerned about any link juice it has dropping off and since it does provide some links to our root site currently (since it's basically a separate site).  Basically i'm wondering if it'll be worth the effort or if i should just keep it separate and focus on other content gen strategies.

                          Technical SEO | | SCFederal
                          0
                        • JohannCR

                          Internal search : rel=canonical vs noindex vs robots.txt

                          Hi everyone, I have a website with a lot of internal search results pages indexed. I'm not asking if they should be indexed or not, I  know they should not according to Google's guidelines. And they make a bunch of duplicated pages so I want to solve this problem. The thing is, if I noindex them, the site is gonna lose a non-negligible chunk of traffic : nearly 13% according to google analytics !!! I thought of blocking them in robots.txt. This solution would not keep them out of the index. But the pages appearing in GG SERPS would then look empty (no title, no description), thus their CTR would plummet and I would lose a bit of traffic too... The last idea I had was to use a rel=canonical tag pointing to the original search page (that is empty, without results), but it would probably have the same effect as noindexing them, wouldn't it ? (never tried so I'm not sure of this) Of course I did some research on the subject, but each of my finding recommanded one of the 3 methods only ! One even recommanded noindex+robots.txt block which is stupid because the noindex would then be useless... Is there somebody who can tell me which option is the best to keep this traffic ? Thanks a million

                          Technical SEO | | JohannCR
                          0
                        • RobMay

                          Using hyphenated sub-domains or non-hyphenated sub-domains? What is the question! I Any takers?

                          For our corporate business level domain, we are exploring using a hyphenated sub-domain foir a project. Something like www.go-figure.extreme.com I thought from a user perspective it seems cluttered. The domain length might also be an issue with the new Algorithm big G has launched in recent past. I know with past experience, hyphenated domains usually take longer to index, as they are used by spammers more frequently and can take longer to get out of the supplementary index. Our company site has over 90 million viewers / year, so our brand is well established and traffic isn't an issue. This is for a corporate level project and I didn't have the answer! Will this work? anyone have any experience testing this. Any thoughts will help! Thanks, Rob

                          Technical SEO | | RobMay
                          0
                        • sboelter

                          Multiple Domains, Same IP address, redirecting to preferred domain (301) -site is still indexed under wrong domains

                          Due to acquisitions over time and the merging of many microsites into one major site, we currently have 20+ TLD's  pointing to the same IP address as our "preferred domain:"  for our consolidated website http://goo.gl/gH33w. They are all set up as 301 redirects on apache - including both the www and non www versions. When we launched this consolidated website, (April 2010) we accidentally left the settings of our site open to accept any of our domains on the same IP.  This was later fixed but unfortunately Google indexed our site under multiple of these URL's (ignoring the redirects) using the same content from our main website but swapping out the domain.  We added some additional redirects on apache to redirect these individual pages pages indexed under the wrong domain to the same page under our main domain http://goo.gl/gH33w.  This seemed to help resolve the issue and moved hundreds of pages off the index.  However, in December of 2010 we made significant changes in our external dns for our ip addresses and now since December, we see pages indexed under these redirecting domains on the rise again. If you do a search query of : site:laboratoryid.com you will see a few hundred examples of pages indexed under the wrong domain.  When you click on the link, it does redirect to the same page but under the preferred domain.  So the redirect is working and has been confirmed as 301.  But for some reason Google continues to crawl our site and index under this incorrect domains.  Why is this? Is there a setting we are missing?   These domain level and page level redirects should be decreasing the pages being indexed under the wrong domain but it appears it is doing the reverse. All of these old domains currently point to our production IP address where are preferred domain is also pointing.  Could this be the issue? None of the pages indexed today are from the old version of these sites. They only seem to be the new content from the new site but not under the preferred domain. Any insight would be much appreciated because we have tried many things without success to get this resolved.

                          Technical SEO | | sboelter
                          0
                        • gallantc

                          Starting a new product, should we use new domain or subdomain

                          I'm working with a company that has a high page rank on it's main domain and is looking to launch a new business / product offering.  They are evaluating either creating a subdomain or launching a brand new domain.  In either case, their current site will link contextually to the new site.  Is there one method that would be better for SEO than the other? The new business / product is related to the main offering, but may appeal to different / new customers.  The new business / product does need it's own homepage and will have a different conversion funnel than the existing business.

                          Technical SEO | | gallantc
                          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 - 2025 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.