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The tool Reverse IP Domain Checker can be used to search for domain names hosted on the same IP address (same shared server). This is common because most people use shared hosting, which is inexpensive (each dedicated IP address costs about $2 per month) because all websites share the same dedicated server with one IP address. Simply enter a domain name or an IP address to get a list of domain names with the same IP address.
The Reverse IP Lookup tool will return a list of gTLD and ccTLD domains that have been added to the subject IP address since our most recent record update for that IP address. The results may not include all domains associated with the subject IP address.
What is the relationship between reverse IP and SEO (search engine optimization)?
Almost all popular search engines (Google, Yahoo, Bing, Yandex, and others) boost a website's rank based on the number of links pointing to it. In order to artificially inflate the popularity of a website, an individual may create hundreds or even thousands of dummy web sites with little to no content other than links pointing to a specific domain name.
Search engines use one method to detect this type of malicious behavior: they check to see if the inter-linking web sites are hosted on the same IP address or IP address range. If the websites share the same IP address range, they are almost certainly run by the same person. Links from websites pointing to other websites hosted on the same IP address range are devalued by search engines.
Search engines, on the other hand, value links from websites hosted on different IP addresses. A good search engine optimizer would go beyond simply hosting interconnected websites on different IP addresses. The websites would be hosted on different class C network addresses. They would ensure that all of their domains were registered under different names with different registrars.
They would not use the same template on more than one web site. They would erase all traces that their sites are operated by the same individual. They would go through all of this trouble with one goal in mind - to game the search engines in order to bring in more organic traffic.
For most web sites, having a dedicated unique IP address will have little to no effect on search engine rankings. Matt Cutts, the head of Google's Webspam team, stated: "If you are an average webmaster and just running a few sites, I wouldn't worry about them being on the same IP address and I definitely wouldn't worry about them being on the same server. That's something that everybody does."
Suggestions and Solutions
To avoid any potential issues associated with IP address sharing, it is best to obtain a unique IP address for your website. Contact your web host and request your own unique IP address. Make it clear that you want a new IP address, not one that has been recycled. Web hosts frequently re-use IP addresses that spammers have previously blacklisted.
You may need to speak with several people before finding a technician who understands your request. A unique IP address for your website can cost anywhere from $25 to $100 for the initial setup fee, and $2 to $25 per month after that.