Reverse IP Lookup identifies domains hosted on a single IP address. It’s useful for discovering other sites sharing the same server or identifying potential neighbors that might impact your site’s performance or reputation. By inputting an IP, the tool returns a list of associated domains, which can reveal hosting arrangements or inadvertently related sites. SEO pros sometimes use this to check if a competitor is hosting many sites on one IP or see if a questionable domain is co-located with their own. Reverse IP offers a unique perspective on how web hosting is allocated and shared.