A shared IP is an IP address that is used for multiple sites. A shared IP can host all sites on a webserver. Because the IP address of a website is used for various sites on the server the actions of one site owner can affect everyone on the server. For example, if an IP address is blacklisted for spamming this will blacklist mail for all sites using the shared IP address. We work hard to prevent and to resolve these issues immediately and take corrective action against anyone who abuses the system. You will not be able to install an SSL certificate if your site is on a shared IP.