There are over 243 country code top level domains (ccTLDs). Most ccTLDs correspond to the two-letter ISO 3166-1 country codes, but there are several differences. Each country appoints managers for its ccTLD and sets the rules for allocating domains. Some countries allow anyone in the world to acquire a domain in their ccTLD, for example Austria (at) and Cocos (Keeling) Islands (cc). Other countries or dependent territories allow only citizens to acquire a domain in their ccTLD, for example Canada (ca).
The domain name system or domain name server (DNS) is a system that stores information associated with domain names in a distributed database of networks, such as the Internet. The domain name system (domain name server) associates many types of information with domain names, but most importantly, it translates the domain name (computer hostnames) to IP addresses. It also lists mail exchange servers accepting e-mail for each domain. In providing a worldwide keyword-based redirection service, DNS is an essential component of contemporary Internet use.
A domain name is a unique name corresponding to the numeric IP address of a computer on the Internet. Internet users access your website using your domain name. Domain name can be up to sixty-seven characters long.
A domain name registrar is a company accredited by the Internet Corporation for Assigned Names and Numbers (ICANN) to sell Internet domain names. ICANN has authority over gTLDs, or Generic Top Level Domains. Examples of gTLDs include .com, .net and .org. ICANN does not have authority over ccTLDs, or Country Code Top-Level Domains. Registrars compete with each other to provide the best support and services at the lowest price.
The Internet Corporation for Assigned Names and Numbers (ICANN) is an internationally organized, non-profit corporation that has responsibility for Internet Protocol (IP) address space allocation, protocol identifier assignment, generic (gTLD) and country code (ccTLD) Top-Level Domain name system management, and root server system management functions. These services were originally performed under U.S. Government contract by the Internet Assigned Numbers Authority (IANA) and other entities. ICANN now performs the IANA function.
An IP address (Internet Protocol address) is a unique
number that devices use in order to identify and communicate with each
other on a computer network utilizing the Internet Protocol standard
(IP). Any participating network device - including routers, computers,
time-servers, printers, internet fax machines, and some telephones -
must have its own unique address.
An IP address can also be thought
of as the equivalent of a street address or a phone number for a
computer or other network device on the internet. Just as each street
address and phone number uniquely identifies a building or telephone,
an IP address can uniquely identify a specific computer or other
network device on a network.
In the Domain Name System (DNS) hierarchy, a second-level domain
is a domain that is directly below a top-level domain (TLD). For
example, in en.wikipedia.org, wikipedia is the second-level domain of
the .org TLD.
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A top-level domain (TLD) is the last part of an
Internet domain name; that is, the letters which follow the final 'dot'
of any URL. For example, in the domain name wikipedia.org, the
top-level domain is org (or ORG, as domain names are not
case-sensitive).
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