Reverse IP Lookup
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What Is Reverse IP Lookup?
Reverse IP lookup finds which domain names are hosted on a given IP address — the opposite of a DNS lookup. On shared hosting, dozens or hundreds of sites can share one IP, and this tool lists the ones it can see.
Why Investigate an IP's Neighbors
If your site shares a server with spam or phishing sites, your email deliverability and reputation can suffer by association. SEOs check neighbors before buying hosting; security researchers map attacker infrastructure by pivoting from one malicious domain to every site on its IP.
Limitations
Results are never complete — large hosts and CDNs (like Cloudflare) put thousands of sites behind single IPs, and many entries are hidden. Treat it as a sample of visible neighbors, not a census.