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As you know, DNS resolution maps a fully qualified domain name (FQDN), such as to an IP address. The reverse is also true: By performing a reverse lookup, DNS can determining the fully qualified domain name associated with an IP address.
Many different Web sites can map to a single IP address, but the reverse isn't true; an IP address can map to only one FQDN.
Everyone in the world has a first name and a last, or family, name.
This step is important, because the IP address of a Web site's server, not the Web site's name, is used in routing traffic over the Internet.
For example, the domain has a number of children, such as mail.for the Web and mail servers, respectively.
BIND is an acronym for the Berkeley Internet Name Domain project, which is a group that maintains the DNS-related software suite that runs under Linux.
This means that forward and reverse entries frequently don't match.
The reverse DNS entries are usually the responsibility of the ISP hosting your site, so it is quite common for the reverse lookup to resolve to the ISP's domain.