Concept
Top-level domain
Related concepts (50)
.sh
.sh is the Internet country code top-level domain (ccTLD) for the British Overseas Territory of Saint Helena, Ascension and Tristan da Cunha, although it is primarily used in Saint Helena (Ascension Island has its own ccTLD, .ac). Registrations of internationalized domain names are also accepted. On 22 February 2010 the ISO 3166-1 code for Saint Helena, Ascension and Tristan da Cunha changed to reflect the SH used for the ccTLD. There are seven second level domains: co.sh – commercial entities com.
.asia
The top-level domain .asia is the officially designated regional domain in the Internet for Asia and the Pacific. It is a sponsored generic top-level-domain (gTLD) operated by the DotAsia Organisation Ltd. The domain is open to companies, individuals and organisations that have a connection to the region. Asia domains can be seen and used by international and Asian businesses; regional conferences and symposiums; as well as Asian artists and celebrities.
.cd
.cd is the Internet country code top-level domain (ccTLD) for the Democratic Republic of the Congo. It was created in 1997 as a replacement for the .zr (Zaire) ccTLD, which was phased out and eventually deleted in 2001. Except for reserved names like .com.cd, .net.cd, .org.cd and others, any person in the world can register a .cd domain for a fee. The ccTLD is popular (and thus economically valuable) owing to it being an abbreviation for compact disc (other similar ccTLDs are .fm, .am, .tv, .dj, .mu, and .
.biz
.biz is a generic top-level domain (gTLD) in the Domain Name System of the Internet. It is intended for registration of domains to be used by businesses. The name is a phonetic spelling of the first syllable of business. The TLD was created to relieve some of the demand for domain names in the top-level domain, and to provide an alternative for businesses whose preferred domain name in had already been registered by another party. There are no specific legal or geographic qualifications to register a domain name, except that it must be for "bona fide business or commercial use.
.onion
.onion is a special-use top level domain name designating an anonymous onion service, which was formerly known as a "hidden service", reachable via the Tor network. Such addresses are not actual DNS names, and the .onion TLD is not in the Internet DNS root, but with the appropriate proxy software installed, Internet programs such as web browsers can access sites with .onion addresses by sending the request through the Tor network.
.local
The domain name .local is a special-use domain name reserved by the Internet Engineering Task Force (IETF) so that it may not be installed as a top-level domain in the Domain Name System (DNS) of the Internet. As such it is similar to the other special domain names, such as .localhost. However, .local has since been designated for use in link-local networking, in applications of multicast DNS (mDNS) and zero-configuration networking (zeroconf) so that DNS service may be established without local installations of conventional DNS infrastructure on local area networks.
Deep web
The deep web, invisible web, or hidden web are parts of the World Wide Web whose contents are not indexed by standard web search-engine programs. This is in contrast to the "surface web", which is accessible to anyone using the Internet. Computer scientist Michael K. Bergman is credited with inventing the term in 2001 as a search-indexing term. Deep web sites can be accessed by a direct URL or IP address, but may require entering a password or other security information to access actual content.
Special-use domain name
A special-use domain name is a domain name that is defined and reserved in the hierarchy of the Domain Name System of the Internet for special purposes. The designation of a reserved special-use domain is authorized by the Internet Engineering Task Force (IETF) and executed, maintained, and published by the Internet Assigned Numbers Authority (IANA). The following list comprises the domain names list by IANA in the category of special-use domain names.
Fully qualified domain name
A fully qualified domain name (FQDN), sometimes also referred to as an absolute domain name, 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. A fully qualified domain name is distinguished by its lack of ambiguity in terms of DNS zone location in the hierarchy of DNS labels: it can be interpreted only in one way.
.ai
.ai is the Internet country code top-level domain (ccTLD) for Anguilla, a British Overseas Territory in the Caribbean. It is administered by the government of Anguilla. It is popular with companies in and projects related to the artificial intelligence industry (AI). Registrations within off.ai, com.ai, net.ai, and org.ai are available unrestrictedly, worldwide. From September 15, 2009, second level registrations within .ai are available to everyone worldwide. The minimum registration term allowed for .