: It won't affect the SEO of a website. Lots of sites are on the same IP address. In fact some IP addresses are the homes for thousands of websites (a big web hosts). Sharing an IP address

@Pope3001725

It won't affect the SEO of a website. Lots of sites are on the same IP address. In fact some IP addresses are the homes for thousands of websites (a big web hosts). Sharing an IP address may be used to help find "bad neighborhoods" which are sites designed to promote themselves or one "main" site by increasing link popularity. But that doesn't affect the ranking of webpages and is only used to find spam.

Additionally, using the CMS is also not an issue as lots of sites use the same CMS. For example WordPress based sites probably number in the tens or even hundreds of thousands. The same goes for drupal or joomla. Duplicate content only comes into play with the content itself. What they should do with the 40% of their content that is duplicate content is use canonical URLs to point to the page they want to be listed in the SERPs.

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