Generally, having a website on a shared IP address will not cause you any harm. However, there are a few cases when a static IP is required.
Having your own Private SSL Certificate. Secure e-commerce websites need SSL certificates for accepting credit cards online. Web hosts usually offer a shared SSL certificate where clients can share the Web host’s SSL. If you are using your Web hosting provider’s shared SSL you don’t need a static IP.
Anonymous FTP. It means that anyone using the FTP software can access files in a special directory of your site. It’s called Anonymous FTP because the user name used to access is “anonymous.” Many Web hosting providers require a static IP for the anonymous FTP function to work properly.
You want to access your website by FTP or Web browser even when the domain name is inaccessible, such as domain name propagation periods.
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