If, for example, your primary target website appears secure, you may be able to gain access to the underlying operating system by attacking a less secure site on the same server. Security.Reverse IP lookups check DNS records to locate the address’ A records and map a domain name to the physical IP address of the device. This helps determine the virtual hosts from web servers, thus identifying server weaknesses and improving security. Conversely, search engines value links from web sites hosted on different IP addresses. An effective search engine optimizer would go further than hosting inter-linking web sites on different IP addresses. They would host the web sites on completely different class C network addresses. They would make sure that all of their domains were registered with different registrars under different names. They would not use the same template on more than one web site. They would erase all traces that their sites are operated by the same individual. They would go through all of this trouble with one goal in mind – to game the search engines in order to bring in more organic traffic. It is also common in many organizations and can be an excellent way to expand the attack surface during reconnaissance of a web server. If for example, your primary target web site appears to be secure, you may be able to gain access to the underlying operating system by attacking a less secure site on the same server.
