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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.