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58-859: CNNIC is responsible for operating and administering China’s domain name registry . CNNIC manages both the " .cn " country code top level domain and the Chinese domain name system (internationalized domain names that contain Chinese characters ). As of April 2017, the total number of Chinese domain names was about 21 million. As of January 2017, CNNIC only opened the CN domain to registered businesses, required supporting documentations for domain registration such as business license or personal ID, and suspended overseas registrars even for domestic registrants. CNNIC denied that it mandated existing personal domain names to be transferred to businesses. Trend Micro suggested this move

116-508: A World Wide Web server, and mail.example.com could be an email server, each intended to perform only the implied function. Modern technology allows multiple physical servers with either different (cf. load balancing ) or even identical addresses (cf. anycast ) to serve a single hostname or domain name, or multiple domain names to be served by a single computer. The latter is very popular in Web hosting service centers, where service providers host

174-489: A first-come-first-served system of allocation but may reject the allocation of specific domains on the basis of political, religious, historical, legal or cultural reasons. For example, in the United States , between 1996 and 1998, InterNIC automatically rejected domain name applications based on a list of perceived obscenities. Registries may also control matters of interest to their local communities; for example,

232-523: A tree of domain names. Each node in the tree holds information associated with the domain name. The tree sub-divides into zones beginning at the DNS root zone . A domain name consists of one or more parts, technically called labels , that are conventionally concatenated, and delimited by dots, such as example.com . When the Domain Name System was devised in the 1980s, the domain name space

290-542: A CNNIC root with a notBefore date on or after 1 April 2015." Domain name registry A domain name registry is a database of all domain names and the associated registrant information in the top level domains of the Domain Name System (DNS) of the Internet that enables third party entities to request administrative control of a domain name. Most registries operate on the top-level and second-level of

348-542: A database of artists and agents, chose whorepresents.com , which can be misread. In such situations, the proper meaning may be clarified by placement of hyphens when registering a domain name. For instance, Experts Exchange , a programmers' discussion site, used expertsexchange.com , but changed its domain name to experts-exchange.com . The domain name is a component of a uniform resource locator (URL) used to access websites , for example: A domain name may point to multiple IP addresses to provide server redundancy for

406-517: A domain name, the labels are separated by a full stop (period). Domain names are often seen in analogy to real estate in that domain names are foundations on which a website can be built, and the highest quality domain names, like sought-after real estate, tend to carry significant value, usually due to their online brand-building potential, use in advertising, search engine optimization , and many other criteria. A few companies have offered low-cost, below-cost or even free domain registration with

464-429: A few other alternative DNS root providers that try to compete or complement ICANN's role of domain name administration, however, most of them failed to receive wide recognition, and thus domain names offered by those alternative roots cannot be used universally on most other internet-connecting machines without additional dedicated configurations. In the process of registering a domain name and maintaining authority over

522-579: A full list is available on their web site. Country code top-level domains (ccTLD) are delegated by IANA to national registries such as DENIC in Germany and Nominet in the United Kingdom. Some name registries are government departments (e.g., the registry for India gov.in ). Some are co-operatives of Internet service providers (such as DENIC ) or not-for profit companies (such as Nominet UK ). Others operate as commercial organizations, such as

580-483: A general category, rather than a specific or personal instance, for example, the name of an industry, rather than a company name. Some examples of generic names are books.com , music.com , and travel.info . Companies have created brands based on generic names, and such generic domain names may be valuable. Domain names are often simply referred to as domains and domain name registrants are frequently referred to as domain owners , although domain name registration with

638-473: A lack of response to a domain name query as an indication that the domain does not exist, and that the message can be treated as undeliverable. The original VeriSign implementation broke this assumption for mail, because it would always resolve an erroneous domain name to that of Site Finder. While VeriSign later changed Site Finder's behaviour with regard to email, there was still widespread protest about VeriSign's action being more in its financial interest than in

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696-452: A personal computer used to access the Internet, or a server computer. Domain names are formed by the rules and procedures of the Domain Name System (DNS). Any name registered in the DNS is a domain name. Domain names are organized in subordinate levels ( subdomains ) of the DNS root domain, which is nameless. The first-level set of domain names are the top-level domains (TLDs), including

754-453: A registrar does not confer any legal ownership of the domain name, only an exclusive right of use for a particular duration of time. The use of domain names in commerce may subject them to trademark law . The practice of using a simple memorable abstraction of a host's numerical address on a computer network dates back to the ARPANET era, before the advent of today's commercial Internet. In

812-579: A second- or third-level domain name is usually administered by a domain name registrar who sell its services to the public. A fully qualified domain name (FQDN) is a domain name that is completely specified with all labels in the hierarchy of the DNS, having no parts omitted. Traditionally a FQDN ends in a dot ( . ) to denote the top of the DNS tree. Labels in the Domain Name System are case-insensitive , and may therefore be written in any desired capitalization method, but most commonly domain names are written in lowercase in technical contexts. A hostname

870-400: A set of special-use domain names. This list contains domain names such as example , local , localhost , and test . Other top-level domain names containing trade marks are registered for corporate use. Cases include brands such as BMW , Google , and Canon . Below the top-level domains in the domain name hierarchy are the second-level domain (SLD) names. These are the names directly to

928-492: A system of third-level domains on users. DENIC, the registry for Germany ( .de ), does not impose third level domains. AFNIC, the registry for France ( .fr ), has some third level domains, but not all registrants have to use them. Many ccTLDs have moved from compulsory third or fourth-level domain to the availability of registrations of second level domains. Among them are .us (April 2002), .mx (May 2009), .co (March 2010), and .uk (June 2014). Domain name In

986-441: A variety of models adopted to recoup the costs to the provider. These usually require that domains be hosted on their website within a framework or portal that includes advertising wrapped around the domain holder's content, revenue from which allows the provider to recoup the costs. Domain registrations were free of charge when the DNS was new. A domain holder may provide an infinite number of subdomains in their domain. For example,

1044-469: Is sos.state.oh.us . 'sos' is said to be a sub-domain of 'state.oh.us', and 'state' a sub-domain of 'oh.us', etc. In general, subdomains are domains subordinate to their parent domain. An example of very deep levels of subdomain ordering are the IPv6 reverse resolution DNS zones , e.g., 1.0.0.0.0.0.0.0.0.0.0.0.0.0.0.0.0.0.0.0.0.0.0.0.0.0.0.0.0.0.0.0.ip6.arpa, which is the reverse DNS resolution domain name for

1102-478: Is a domain name that has at least one associated IP address . Domain names serve to identify Internet resources, such as computers, networks, and services, with a text-based label that is easier to memorize than the numerical addresses used in the Internet protocols. 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

1160-521: Is also significant disquiet regarding the United States Government's political influence over ICANN. This was a significant issue in the attempt to create a .xxx top-level domain and sparked greater interest in alternative DNS roots that would be beyond the control of any single country. Additionally, there are numerous accusations of domain name front running , whereby registrars, when given whois queries, automatically register

1218-487: Is also used for the leaf labels in the domain name system, usually without further subordinate domain name space. Hostnames appear as a component in Uniform Resource Locators (URLs) for Internet resources such as websites (e.g., en.wikipedia.org). Domain names are also used as simple identification labels to indicate ownership or control of a resource. Such examples are the realm identifiers used in

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1276-569: Is maintained and serviced technically by an administrative organization operating a registry. A registry is responsible for maintaining the database of names registered within the TLD it administers. The registry receives registration information from each domain name registrar authorized to assign names in the corresponding TLD and publishes the information using a special service, the WHOIS protocol. Registries and registrars usually charge an annual fee for

1334-702: Is responsible for the creation and maintenance of the state top-level network catalog database . This database provides information on Internet users , web addresses , domain names, and AS numbers . CNNIC conducts technical research and undertakes state technical projects based on its administrative and practical network technology experience. CNNIC has conducted, and continues to conduct, surveys of Internet information resources. CNNIC maintains statistics on topics such as Internet bandwidth in China, Domain Name registrations, and Internet Development in China . As

1392-491: The generic top-level domains (gTLDs), such as the prominent domains com , info , net , edu , and org , and the country code top-level domains (ccTLDs). Below these top-level domains in the DNS hierarchy are the second-level and third-level domain names that are typically open for reservation by end-users who wish to connect local area networks to the Internet, create other publicly accessible Internet resources or run websites, such as "wikipedia.org". The registration of

1450-569: The ARPA domain serves technical purposes in the infrastructure of the Domain Name System. During the 32nd International Public ICANN Meeting in Paris in 2008, ICANN started a new process of TLD naming policy to take a "significant step forward on the introduction of new generic top-level domains." This program envisions the availability of many new or already proposed domains, as well as a new application and implementation process. Observers believed that

1508-620: The Anti-Phishing Alliance of China (APAC) in order to tackle phishing activities that abuse .cn sub-domain names. CNNIC also functions as the secretariat of APAC. In 2015, Google discovered that CNNIC had issued an intermediate CA certificate to an Egypt-based firm that used CNNIC's keys to impersonate Google domains. Google responded by removing CNNIC's root certificate from the certificate store in Google Chrome and all of Google's products. Mozilla responded to

1566-527: The HTTP request header field Host: , or Server Name Indication . Critics often claim abuse of administrative power over domain names. Particularly noteworthy was the VeriSign Site Finder system which redirected all unregistered .com and .net domains to a VeriSign webpage. For example, at a public meeting with VeriSign to air technical concerns about Site Finder , numerous people, active in

1624-496: The IETF and other technical bodies, explained how they were surprised by VeriSign's changing the fundamental behavior of a major component of Internet infrastructure, not having obtained the customary consensus. Site Finder, at first, assumed every Internet query was for a website, and it monetized queries for incorrect domain names, taking the user to VeriSign's search site. Other applications, such as many implementations of email, treat

1682-520: 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 application-specific naming and addressing purposes. In general, a domain name identifies a network domain or an Internet Protocol (IP) resource, such as

1740-554: The Session Initiation Protocol (SIP), the Domain Keys used to verify DNS domains in e-mail systems, and in many other Uniform Resource Identifiers (URIs). An important function of domain names is to provide easily recognizable and memorizable names to numerically addressed Internet resources. This abstraction allows any resource to be moved to a different physical location in the address topology of

1798-436: The com , net , org , info domains and others, use a registry-registrar model consisting of hundreds of domain name registrars (see lists at ICANN or VeriSign). In this method of management, the registry only manages the domain name database and the relationship with the registrars. The registrants (users of a domain name) are customers of the registrar, in some cases through additional layers of resellers. There are also

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1856-462: The DNS. A registry operator , sometimes called a network information center ( NIC ), maintains all administrative data of the domain and generates a zone file which contains the addresses of the nameservers for each domain. Each registry is an organization that manages the registration of domain names within the domains for which it is responsible, controls the policies of domain name allocation, and technically operates its domain. It may also fulfill

1914-660: The German, Japanese and Polish registries have introduced internationalized domain names to allow use of local non- ASCII characters. Domains that are registered with ICANN registrars, generally have to use the Uniform Domain-Name Dispute-Resolution Policy ( UDRP ), however, Germany's DENIC requires people to use the German civil courts, and Nominet UK deals with intellectual property and other disputes through its own dispute resolution service. Domain name registries may also impose

1972-501: The IP address of a loopback interface, or the localhost name. Second-level (or lower-level, depending on the established parent hierarchy) domain names are often created based on the name of a company (e.g., bbc .co.uk), product or service (e.g. hotmail .com). Below these levels, the next domain name component has been used to designate a particular host server. Therefore, ftp.example.com might be an FTP server, www.example.com would be

2030-572: The US registry ( nic.us ). The allocated and assigned domain names are made available by registries by use of the WHOIS system and via their domain name servers . Some registries sell the names directly, and others rely on separate entities to sell them. For example, names in the .com top-level domains are in some sense sold "wholesale" at a regulated price by VeriSign , and individual domain name registrars sell names "retail" to businesses and consumers. Historically, domain name registries operated on

2088-480: The ccTLDs combined. As of December 31, 2023, 359.8 million domain names had been registered. The right to use a domain name is delegated by domain name registrars , which are accredited by the Internet Corporation for Assigned Names and Numbers (ICANN), the organization charged with overseeing the name and number systems of the Internet. In addition to ICANN, each top-level domain (TLD)

2146-589: The complete list of TLD registries and domain name registrars. Registrant information associated with domain names is maintained in an online database accessible with the WHOIS protocol. For most of the 250 country code top-level domains (ccTLDs), the domain registries maintain the WHOIS (Registrant, name servers, expiration dates, etc.) information. Some domain name registries, often called network information centers (NIC), also function as registrars to end-users. The major generic top-level domain registries, such as for

2204-609: The early network, each computer on the network retrieved the hosts file ( host.txt ) from a computer at SRI (now SRI International ), which mapped computer hostnames to numerical addresses. The rapid growth of the network made it impossible to maintain a centrally organized hostname registry and in 1983 the Domain Name System was introduced on the ARPANET and published by the Internet Engineering Task Force as RFC 882 and RFC 883. The following table shows

2262-404: The first five .com domains with the dates of their registration: and the first five .edu domains: Today, the Internet Corporation for Assigned Names and Numbers (ICANN) manages the top-level development and architecture of the Internet domain name space. It authorizes domain name registrars , through which domain names may be registered and reassigned. The domain name space consists of

2320-414: The first quarter of 2015, 294 million domain names had been registered. A large fraction of them are in the com TLD, which as of December 21, 2014, had 115.6 million domain names, including 11.9 million online business and e-commerce sites, 4.3 million entertainment sites, 3.1 million finance related sites, and 1.8 million sports sites. As of July 15, 2012, the com TLD had more registrations than all of

2378-645: The function of a domain name registrar , or may delegate that function to other entities. Domain names are managed under a hierarchy headed by the Internet Assigned Numbers Authority (IANA), which manages the top of the DNS tree by administrating the data in the root nameservers . IANA also operates the int registry for intergovernmental organizations, the arpa zone for protocol administration purposes, and other critical zones such as root-servers.net . IANA delegates all other domain name authority to other domain name registries and

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2436-400: The growth of China’s internet, facilitating the development and application of Internet resources and relevant technologies, and actively participating in the research work of domestic Internet development and administration policies. In July 2008, a broad alliance of Chinese online commerce stakeholders , including CNNIC, all major Chinese commercial banks and web hosting companies, founded

2494-476: The highest level of domain names of the Internet. Top-level domains form the DNS root zone of the hierarchical Domain Name System . Every domain name ends with a top-level domain label. During the growth of the Internet, it became desirable to create additional generic top-level domains. As of October 2009, 21 generic top-level domains and 250 two-letter country-code top-level domains existed. In addition,

2552-542: The incident, stating that "The Mozilla CA team believes that CNNIC’s actions amount to egregious behaviour, and the violations of policy are greater in severity than those in previous incidents. CNNIC’s decision to violate their own Certification Practice Statement is especially serious, and raises concerns that go beyond the immediate scope of the misissued intermediate certificate. After public discussion... we are planning to change Firefox ’s certificate validation code such that it refuses to trust any certificate issued by

2610-406: The interest of the Internet infrastructure component for which VeriSign was the steward. Despite widespread criticism, VeriSign only reluctantly removed it after the Internet Corporation for Assigned Names and Numbers (ICANN) threatened to revoke its contract to administer the root name servers. ICANN published the extensive set of letters exchanged, committee reports, and ICANN decisions. There

2668-445: The left of .com, .net, and the other top-level domains. As an example, in the domain example.co.uk , co is the second-level domain. Next are third-level domains, which are written immediately to the left of a second-level domain. There can be fourth- and fifth-level domains, and so on, with virtually no limitation. Each label is separated by a full stop (dot). An example of an operational domain name with four levels of domain labels

2726-549: The national Network Information Center (NIC), CNNIC maintains cooperative relationships with other International Internet Communities, and works closely with NICs of other countries. CNNIC serves as the Secretariat of the Internet Society of China ’s Internet Policy and Resource Committee. The Policy and Resource committee is in charge of tasks such as providing policy and legislation oriented suggestions to promote

2784-413: The network, globally or locally in an intranet . Such a move usually requires changing the IP address of a resource and the corresponding translation of this IP address to and from its domain name. Domain names are used to establish a unique identity. Organizations can choose a domain name that corresponds to their name, helping Internet users to reach them easily. A generic domain is a name that defines

2842-410: The new name space created, registrars use several key pieces of information connected with a domain: A domain name consists of one or more labels, each of which is formed from the set of ASCII letters, digits, and hyphens (a–z, A–Z, 0–9, -), but not starting or ending with a hyphen. The labels are case-insensitive; for example, 'label' is equivalent to 'Label' or 'LABEL'. In the textual representation of

2900-442: The new rules could result in hundreds of new top-level domains to be registered. In 2012, the program commenced, and received 1930 applications. By 2016, the milestone of 1000 live gTLD was reached. The Internet Assigned Numbers Authority (IANA) maintains an annotated list of top-level domains in the DNS root zone database. For special purposes, such as network testing, documentation, and other applications, IANA also reserves

2958-484: The owner of example.org could provide subdomains such as foo.example.org and foo.bar.example.org to interested parties. Many desirable domain names are already assigned and users must search for other acceptable names, using Web-based search features, or WHOIS and dig operating system tools. Many registrars have implemented domain name suggestion tools which search domain name databases and suggest available alternative domain names related to keywords provided by

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3016-446: The service of delegating a domain name to a user and providing a default set of name servers. Often, this transaction is termed a sale or lease of the domain name, and the registrant may sometimes be called an "owner", but no such legal relationship is actually associated with the transaction, only the exclusive right to use the domain name. More correctly, authorized users are known as "registrants" or as "domain holders". ICANN publishes

3074-420: The services offered, a feature that is used to manage the traffic of large, popular websites. Web hosting services , on the other hand, run servers that are typically assigned only one or a few addresses while serving websites for many domains, a technique referred to as virtual web hosting . Such IP address overloading requires that each request identifies the domain name being referenced, for instance by using

3132-539: The user. The business of resale of registered domain names is known as the domain aftermarket . Various factors influence the perceived value or market value of a domain name. Most of the high-prize domain sales are carried out privately. Also, it is called confidential domain acquiring or anonymous domain acquiring. Intercapping is often used to emphasize the meaning of a domain name, because DNS names are not case-sensitive. Some names may be misinterpreted in certain uses of capitalization. For example: Who Represents ,

3190-479: The valid DNS character set by an encoding called Punycode . For example, københavn.eu is mapped to xn--kbenhavn-54a.eu. Many registries have adopted IDNA. The first commercial Internet domain name, in the TLD com , was registered on 15 March 1985 in the name symbolics.com by Symbolics Inc., a computer systems firm in Cambridge, Massachusetts. By 1992, fewer than 15,000 com domains had been registered. In

3248-582: The websites of many organizations on just a few servers. The hierarchical DNS labels or components of domain names are separated in a fully qualified name by the full stop (dot, . ). The character set allowed in the Domain Name System is based on ASCII and does not allow the representation of names and words of many languages in their native scripts or alphabets. ICANN approved the Internationalized domain name (IDNA) system, which maps Unicode strings used in application user interfaces into

3306-465: Was divided into two main groups of domains. The country code top-level domains (ccTLD) were primarily based on the two-character territory codes of ISO-3166 country abbreviations. In addition, a group of seven generic top-level domains (gTLD) was implemented which represented a set of categories of names and multi-organizations. These were the domains gov , edu , com , mil , org , net , and int . These two types of top-level domains (TLDs) are

3364-512: Was still not enough to stop modern security threats from the .cn domain. CNNIC allocates Internet Protocol (IP) addresses and AS Numbers to domestic ISPs and users. CNNIC is a National Internet Registry (NIR) acknowledged by the Asia-Pacific Network Information Center (APNIC). In late 2004 CNNIC launched an “ IP Allocation Alliance ” which simplified the procedures for obtaining IP addresses . CNNIC

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