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. Websites on same c class IP address

    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.

    Websites on same c class IP address

    Technical SEO
    3
    5
    5865
    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.
    • seoug_2005
      seoug_2005 last edited by

      If two websites are on the same  c class IP address, what does it mean ?

      Does two websites belong to the same company ?

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

        But if you have 20 sites linking to you, and they're all from the same Class C IP address, and those are pretty much your ONLY links, that looks a bit fishy to the search engines. It's a signal to the search engines that "hey, this person can only get links from sites that have a high probability of the same person being in control of all of the sites".

        That's why you'll see people talk about linkbuilding and wanting to do so from different Class C IP addresses.

        1 Reply Last reply Reply Quote 4
        • Olaf
          Olaf @seoug_2005 last edited by

          Not necessarily. f you see different C blocks, you are usually talking about two different webhosts. So there is a chance that different sites from one owner are hosted in one C-block.

          Even an IP-address is not always used for one company. You can have your own IP-address which leads to your website. But providers can also share an IP-address for different domains/ websites for different companies.

          To find if website belong tot the same owner you need to check te registars database or tools like allwhois.com.

          1 Reply Last reply Reply Quote 0
          • seoug_2005
            seoug_2005 @Olaf last edited by

            Thanks Olaf.

            So, does it mean that sites hosted on same C class IP belong to one owner ?

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

              A "C" Block address is based on your IP address.

              For example 190.245.111.001 is a standard IP address. The c-blocks in this case are: AAA.BBB.CCC.001-254

              So these are within the same C-class:

              190.245.111.001
              190.245.111.230

              And these are different C-Class IP's:

              190.245.111.001
              190.245.222.001

              Google may assume that sites hosted in differnet C-blocks are more likely to be from different people.

              seoug_2005 1 Reply Last reply Reply Quote 5
              • 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

              • SwanseaMedicine

                Measuring the size of a competitors website?

                I think our website is too big, far too many indexed pages. I'd like to do some research on how big our competitors' websites are (how many indexed pages). Is there a way to do this? Cheers, Rhys

                Technical SEO | | SwanseaMedicine
                0
              • kirupa

                Why did my website DA fell down?

                Hello, Could you please let me know why might my website's DA have fallen down in merely a week? What might be a reason? I also noticed traffic from google dropped down at the very same week. Will be very thankful for any advise!

                Technical SEO | | kirupa
                0
              • One2OneDigital

                Product meta tags are not updating in my Magneto website!

                I need some help! For some reason, each time I update the product meta tags in my Magento website, it doesn't change on the current website? Could someone help me understand why that is?

                Technical SEO | | One2OneDigital
                0
              • yoursearchteam

                How To Cleanup the Google Index After a Website Has Been HACKED

                We have a client whose website was hacked, and some troll created thousands of viagra pages, which were all indexed by Google.  See the screenshot for an example.  The site has been cleaned up completely, but I wanted to know if anyone can weigh in on how we can cleanup the Google index.  Are there extra steps we should take?  So far we have gone into webmaster tools and submitted a new site map. ^802D799E5372F02797BE19290D8987F3E248DCA6656F8D9BF6^pimgpsh_fullsize_distr.png

                Technical SEO | | yoursearchteam
                0
              • ngupta1

                How to display the full structure of website on Google serps

                I have been searching around but unable to gather information as to how we can control or list  top pages of a website on Google's first page , i.e. if we type seomoz in google , we can see the main listing with 6 subdomain listings , which link to Blog , Seo tool , Beginner Seo guide , Learn Seo , Pricing & Plans and login My question is can we control these listings i.e. what to display and what not , and if yes how can we make this type of visibility on first page , by using html or xml sitemaps or theirs something mostly websites are missing. Cause this type of data is coming up for very less websites and mostly websites are with single urls. c43Ki.jpg

                Technical SEO | | ngupta1
                0
              • joony2008

                Redirecting Root domain to subdirectory by IP addresses (country specific)

                We are using Wordpress Multisite. so www.mysite.com is our English website and www.mysite.com/sub is our Chinese website Can I redirect Chinese visitors who type "www.mysite.com"  to "www.mysite.com/sub" ? so we want to force redirection to www.mysite.com/sub if our website is visited by Chinese IP Address. I've realized that this is called GeoIP Redirection. and our hosting company already has those database, I guess my job is just to simply insert some code in .htacess My question is, would it affect our SEO later on? and what .htacess code is the best practice here?

                Technical SEO | | joony2008
                0
              • RobertFisher

                On a dedicated server with multiple IP addresses, how can one address group be slow/time out and all other IP addresses OK?

                We utilize a dedicated server to host roughly 60 sites on. The server is with a company that utilizes a lady who drives race cars.... About 4 months ago we realized we had a group of sites down thanks to monitoring alerts and checked it out. All were on the same IP address and the sites on the other IP address were still up and functioning well. When we contacted the support at first we were stonewalled, but eventually they said there was a problem and it was resolved within about 2 hours. Up until recently we had no problems. As a part of our ongoing SEO we check page load speed for our clients. A few days ago a client who has their site hosted by the same company was running very slow (about 8 seconds to load without cache). We ran every check we could and could not find a reason on our end. The client called the host and were told they needed to be on some other type of server (with the host) at a fee increase of roughly $10 per month. Yesterday, we noticed one group of sites on our server was down and, again, it was one IP address with about 8 sites on it. On chat with support, they kept saying it was our ISP. (We speed tested on multiple computers and were 22MB down and 9MB up +/-2MB). We ran a trace on the IP address and it went through without a problem on three occassions over about ten minutes. After about 30 minutes the sites were back up. Here's the twist: we had a couple of people in the building who were on other ISP's try and the sites came up and loaded on their machines. Does anyone have any idea as to what the issue is?

                Technical SEO | | RobertFisher
                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

              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
              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.