Reverse IP Lookup helps you **Find Other Web Sites Hosted on a Web Server**. A reverse IP domain check takes a domain name or IP address pointing to a web server and searches for other sites known to be hosted on that same web server.

Knowing the other web sites hosted on a web server is important from both an SEO and web filtering perspective, particularly for those on shared web hosting plans. For a more comprehensive reverse IP lookup with complete results, historical data, and DNS records, try Connected, an internet intelligence platform that tracks the health and history of every domain and IP address on the internet.

All web sites are hosted on web servers, which are computers running specialized software that distribute web content as requested. Since HTTP version 1.1, many domains can be hosted on a single IP address. Simply put, most web sites are hosted on servers that host many other web sites.

While IP sharing is typically transparent to ordinary users, it may cause complications for both search engine optimization and web site filtering. Concerning SEO, search engines devalue links from web sites pointing to other web sites hosted on the same IP address range. Concerning web site filtering, with so many sites sharing IP addresses, IP-based filtering efforts are bound to produce "overblocking", which is the accidental denial of access to web sites that abide by the stated filtering rules.

To avoid any of the potential problems related with IP address sharing, it is best to acquire a unique IP address for your web site. The tool currently does not support sites only using IPv6 addresses.