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2. Domain Name System - Wikipedia

   en.wikipedia.org/wiki/Domain_Name_System

   The Internet maintains two principal namespaces, the domain name hierarchy and the IP address spaces. [2] The Domain Name System maintains the domain name hierarchy and provides translation services between it and the address spaces. Internet name servers and a communication protocol implement the Domain Name System. A DNS name server is a ...

3. Domain name - Wikipedia

   en.wikipedia.org/wiki/Domain_name

   An annotated example of a domain name. In the Internet, a domain name is a string that identifies a realm of administrative autonomy, authority or control. Domain names are often used to identify services provided through the Internet, such as websites, email services and more. Domain names are used in various networking contexts and for ...

4. Fully qualified domain name - Wikipedia

   en.wikipedia.org/wiki/Fully_qualified_domain_name

   A fully qualified domain name (FQDN), sometimes also called an absolute domain name, [1] is a domain name that specifies its exact location in the tree hierarchy of the Domain Name System (DNS). It specifies all domain levels, including the top-level domain and the root zone . [ 2 ]

5. Top-level domain - Wikipedia

   en.wikipedia.org/wiki/Top-level_domain

   A top-level domain (TLD) is one of the domains at the highest level in the hierarchical Domain Name System of the Internet after the root domain. [1] The top-level domain names are installed in the root zone of the name space. For all domains in lower levels, it is the last part of the domain name, that is, the last non-empty label of a fully ...

6. Root name server - Wikipedia

   en.wikipedia.org/wiki/Root_name_server

   The root domain does not have a formal name and its label in the DNS hierarchy is an empty string. All fully qualified domain names (FQDNs) on the Internet can be regarded as ending with this empty string for the root domain, and therefore ending in a full stop character (the label delimiter), e.g., "www.example.com.". This is generally implied ...

7. Namespace - Wikipedia

   en.wikipedia.org/wiki/Namespace

   A hierarchy is recursive if the syntax for the namespace names is the same for each subdelegation. An example of a recursive hierarchy is the Domain name system. An example of a non-recursive hierarchy are Uniform Resource Name representing an Internet Assigned Numbers Authority (IANA) number.

8. Second-level domain - Wikipedia

   en.wikipedia.org/wiki/Second-level_domain

   In the Domain Name System (DNS) hierarchy, a second-level domain (SLD or 2LD) is a domain that is directly below a top-level domain (TLD). For example, in example.com, example is the second-level domain of the .com TLD. Second-level domains commonly refer to the organization that registered the domain name with a domain name registrar.

9. DNS zone - Wikipedia

   en.wikipedia.org/wiki/DNS_zone

   The top-level domain arpa serves as a delegation zone for various technical infrastructure aspects of DNS and the Internet, and does not implement the registration and delegation system of the country and generic domains. The name arpa is a remnant of the ARPANET, one of the predecessor stages of the Internet. Intended as a transitional aid to ...