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2. Virtual hosting - Wikipedia

   en.wikipedia.org/wiki/Virtual_hosting

   Virtual hosting is a method for hosting multiple domain names (with separate handling of each name) on a single server (or pool of servers). [1] This allows one server to share its resources, such as memory and processor cycles, without requiring all services provided to use the same host name.

3. Server Name Indication - Wikipedia

   en.wikipedia.org/wiki/Server_Name_Indication

   A server that is responsible for multiple hostnames is likely to need to present a different certificate for each name (or small group of names). It is possible to use subjectAltName to contain multiple domains controlled by one person [2] in a single certificate. Such "unified communications certificates" must be reissued every time the list ...

4. Domain Name System - Wikipedia

   en.wikipedia.org/wiki/Domain_Name_System

   A reverse DNS lookup is a query of the DNS for domain names when the IP address is known. Multiple domain names may be associated with an IP address. The DNS stores IP addresses in the form of domain names as specially formatted names in pointer (PTR) records within the infrastructure top-level domain arpa. For IPv4, the domain is in-addr.arpa.

5. Shared web hosting service - Wikipedia

   en.wikipedia.org/wiki/Shared_web_hosting_service

   In name-based virtual hosting, also called shared IP hosting, the virtual hosts serve multiple hostnames on a single machine with a single IP address. This is possible because when a web browser requests a resource from a web server using HTTP/1.1 it includes the requested hostname as part of the request.

6. Domain name - Wikipedia

   en.wikipedia.org/wiki/Domain_name

   A domain name may represent entire collections of such resources or individual instances. Individual Internet host computers use domain names as host identifiers, also called hostnames. The term hostname is also used for the leaf labels in the domain name system, usually without further subordinate domain name space.

7. Comparison of DNS server software - Wikipedia

   en.wikipedia.org/wiki/Comparison_of_DNS_server...

   Authoritative server: authoritative name servers publish DNS mappings for domains under their authoritative control. Typically, a company (e.g. "Acme Example Widgets") would provide its own authority services to respond to address queries, or for other DNS information, for www.example.int. These servers are listed as being at the top of the ...