• 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. 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
        6028
        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.
        • 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

                  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

                  • blogwoman1

                    What Tools Should I Use To Investigate Damage to my website

                    indexed urls seo seo audit

                    I would like to know what tools I should use and how to investigate damage to my website in2town.co.uk I hired a person to do some work to my website but they damaged it. That person was on a freelance platform and was removed because of all the complaints made about them. They also put in backdoors on websites including mine and added content. I also had a second problem where my content was being stolen. My site always did well and had lots of keywords in the top five and ten, but now they are not even in the top 200. This happened in January and feb. When I write unique articles, they are not showing in Google and need to find what the problem is and how to fix it. Can anyone please help

                    Technical SEO | | blogwoman1
                    0
                  • Moeen2233

                    Why Google de-rank a website.

                    Hi, I was inspecting a website which is covering the topic of best wheelbarrow of 2021, it is a new website and and starts ranking on google. But, after few days it got de-rank automatically and Moz is also not showing any result to that. I was wandering why this just happened and what should I do if I made my website and will not face this kind of situation?

                    Technical SEO | | Moeen2233
                    0
                  • bhsiao

                    Adding https version of website: how best to redirect

                    If I have 4 versions of my site http://www
                    http://
                    https://www
                    https:// What is the best way to redirect without losing seo positions? i have been mainly using http://www but have recently added my ssl so https works also. I heard at Moz Con that I should get the https working. All of my marketing and ads are going to http://www 301 redirect 3 of them? Which 3? If https is becoming important, should that be my main url? will it hurt my seo to switch? Thank you so much in advance!

                    Technical SEO | | bhsiao
                    0
                  • jmccommas

                    Advice on Linking to an Adult Related Website

                    I have a question regarding whether or not Google would penalize my main website for linking to a website that has adult content. The site I am linking to is not a porn site, rather it is a site that sells web site templates for adult related stores selling sexy toys, videos, etc. For example my site that is linking to the adult related website is here: http://www.websitetemplatedesign.com/ and the link to the site is in the footer at the bottom left which is an icon. And it links to http://www.adultsextemplates.com/ Im just looking for advice as to whether or not this could be a penalty or not. I did suffer major SERP loss in the last month and Im trying to find what I am doing that may have caused this. Any advice would be appreciated.

                    Technical SEO | | jmccommas
                    0
                  • MaartenvandenBos

                    403 forbidden error website

                    Hi Mozzers, I got a question about new website from a new costumer http://www.eindexamensite.nl/. There is a 403 forbidden error on it, and I can't find what the problem is. I have checked on: http://gsitecrawler.com/tools/Server-Status.aspx
                    result:
                    URL=http://www.eindexamensite.nl/ **Result code: 403 (Forbidden / Forbidden)** When I delete the .htaccess from the server there is a 200 OK :-). So it is in the .htaccess. .htaccess code: ErrorDocument 404 /error.html RewriteEngine On
                    RewriteRule ^home$ / [L]
                    RewriteRule ^typo3$ - [L]
                    RewriteRule ^typo3/.$ - [L]
                    RewriteRule ^uploads/.$ - [L]
                    RewriteRule ^fileadmin/.$ - [L]
                    RewriteRule ^typo3conf/.$ - [L]
                    RewriteCond %{REQUEST_FILENAME} !-f
                    RewriteCond %{REQUEST_FILENAME} !-d
                    RewriteCond %{REQUEST_FILENAME} !-l
                    RewriteRule .* index.php Start rewrites for Static file caching RewriteRule ^(typo3|typo3temp|typo3conf|t3lib|tslib|fileadmin|uploads|screens|showpic.php)/ - [L]
                    RewriteRule ^home$ / [L] Don't pull *.xml, *.css etc. from the cache RewriteCond %{REQUEST_FILENAME} !^..xml$
                    RewriteCond %{REQUEST_FILENAME} !^..css$
                    RewriteCond %{REQUEST_FILENAME} !^.*.php$ Check for Ctrl Shift reload RewriteCond %{HTTP:Pragma} !no-cache
                    RewriteCond %{HTTP:Cache-Control} !no-cache NO backend user is logged in. RewriteCond %{HTTP_COOKIE} !be_typo_user [NC] NO frontend user is logged in. RewriteCond %{HTTP_COOKIE} !nc_staticfilecache [NC] We only redirect GET requests RewriteCond %{REQUEST_METHOD} GET We only redirect URI's without query strings RewriteCond %{QUERY_STRING} ^$ We only redirect if a cache file actually exists RewriteCond %{DOCUMENT_ROOT}/typo3temp/tx_ncstaticfilecache/%{HTTP_HOST}/%{REQUEST_URI}/index.html -f
                    RewriteRule .* typo3temp/tx_ncstaticfilecache/%{HTTP_HOST}/%{REQUEST_URI}/index.html [L] End static file caching DirectoryIndex index.html CMS is typo3. any ideas? Thanks!
                    Maarten

                    Technical SEO | | MaartenvandenBos
                    0
                  • Motivators

                    Multiple Domains on 1 IP Address

                    We have multiple domains on the same C Block IP Address. Our main site is an eCommerce site, and we have separate domains for each of the following: our company blog (and other niche blogs), forum site, articles site and corporate site. They are all on the same server and hosted by the same web-hosting company. They all have unique and different content. Speaking strictly from a technical standpoint, could this be hurting us? Can you please make a recommendation for the best practices when it comes to multiple domains like these and having separate or the same IP Addresses? Thank you!

                    Technical SEO | | Motivators
                    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
                  • AaronParrish

                    What is a Class C Subnet and why should I care?

                    So I did a site analysis over at Majestic SEO and it told me that I have 100 Referring IP addresses and 92 are Class C subnets. What does this mean? Are they good, bad or irrelevant?

                    Technical SEO | | AaronParrish
                    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.