Hosted Domains Lookup
Enter an IP address to discover all domain names hosted on that server. Useful for security research, identifying shared hosting environments, and investigating IP reputation.
What you'll get: A paginated list of all domain names currently pointing to the specified IP address, plus the total count of hosted domains.
Why Multiple Domains Share One IP Address
It is entirely normal — and extremely common — for a single IP address to host hundreds or even thousands of different domain names simultaneously. This is achieved through a technique called virtual hosting, where a web server examines the HTTP Host header in each incoming request to determine which website to serve. From a networking perspective, traffic to all those domains arrives at the same IP; the server then sorts it by domain name.
Main Reasons Domains Share an IP
- Shared Hosting: The most common scenario. Budget web hosting plans place dozens to thousands of websites on a single server and IP. This is cost-effective but means your site shares an IP with unrelated neighbors.
- Content Delivery Networks (CDNs): Providers like Cloudflare and Fastly route millions of websites through a relatively small pool of IPs for caching and DDoS protection. A single Cloudflare IP may serve tens of thousands of sites.
- Domain Aliases and Redirects: A single business often registers multiple TLDs (example.com, example.net, example.co.uk) all pointing to the same server, so they all share one IP.
- Reseller Hosting: Web agencies and resellers consolidate client sites on servers leased from major providers, resulting in many unrelated domains on one IP.
- Email Servers: Multiple domain email addresses (MX records) may route through a shared mail server IP, appearing as hosted domains on that address.
What a High Domain Count Tells You
An IP hosting a very large number of domains (thousands) is almost certainly a shared hosting server or CDN edge node — this is neutral and expected. An IP hosting only a handful of very similar-looking domains may indicate a coordinated spam or phishing campaign using related infrastructure. Context matters: compare the domain names themselves, not just the count.
Common Use Cases
- Security research: finding other domains controlled by the same attacker or spam network
- SEO neighborhood analysis: identifying whether low-quality or penalized sites share your hosting IP
- Competitive intelligence: discovering a company's full portfolio of web properties
- Digital forensics: linking related infrastructure in an investigation
- Network administration: auditing all services exposed on a known IP range