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You can use reverse ip lookup for a variety of purposes.
Find all domains that are hosted on the same IP address. Reverse Domain Lookup reveals all of the websites that share the same IP address. Only the domain names that share the IP address are displayed, not the IP address itself. You can use reverse IP lookup to find domains hosted on a competitor's IP address.
This utility can also be used to examine your competitors' websites to determine whether they use dynamic or static IP addresses, as well as how many other sites share the address. Other tools on smallseotools.com can help you determine who their web hosting service providers are.