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Website owners know their IP address, but if they have a dynamic IP address, which most websites do. They don’t know who else is using the shared IP address. If you want to know which other websites are sharing your IP address, you have to run a reverse IP utility.
What the reverse IP utility will do is that it will list all the domain names of the websites that are sharing your dynamic IP address. To do this, you will need to perform a reverse IP address lookup. A reverse IP lookup command is run when your website visitors complain that they are facing problems in finding your website on the internet.
When a visitor complains, or you get an error on your website, you get in touch with your web hosting service provider and tell them about the issue. Or you run a reverse IP address utility find out the domain names that you are sharing a dynamic IP address with and see if those sites are working.
If they are working fine, you know that the problem is with your website only. In this case, you will check the HTML code of your website to check if there's no problem with it. If your website's code is ok and other websites sharing your IP address are working fine, it's your internet hosting service provider who will need to investigate the problem with your website and fix it.
This utility can also be used to check on your competitors' websites and see if they are using dynamic or static IP address and how many other sites are sharing the address. There are other tools in faster-seo.com by which you can trace who their web hosting service providers are.