The dotted decimal notation system was difficult to remember, & hence a new IP addressing system using words was evolved. In this system, an address such as www.amazon.com is called a domain name. Domain names are sets of words that are assigned to specific IP addresses, & these names can have two or more word groups separated by periods. Domain names are formed by the rules and procedures of 'domain name system'. The extreme right part of the domain name is the most general, & each part of it becomes more specific as we move to the left from right. As an example, the domain name www.amazon.com contains 3 parts separated by periods. Starting at the right, the name 'com' indicates that the computer belongs to a company, the company is identified by the name 'amazon', & the word 'www' indicates that the computer is running software that makes it a part of the 'World Wide Web'.
Domain names are organized in subdomains or subordinate levels of DNS root domain, which is nameless. The rightmost part of the domain name is called a "top level domain",which include generic top level domains, such as com, edu, gov, net, info, mill, biz, name, pro, int, & org and the country code top level domains, such as uk, us, ca, au, & de. The Internet Corporation for Assigned Names & Numbers (ICANN) is responsible for managing domain names, & coordinating with the IP address registrars.
Below the top level domains in the domain name hierarchy, are the second level domain names. These are the names directly to the left of top level domains. Next are the third level domain names, immediately to the left of second level domain names. There can be fourth & fifth level domain names, and so on, virtually with no limitations. The hierarchy of domains descend from right to left label in the name. Each label to the left specifies a subdomain of the domain to the right. In the complete domain name 'www.amazon.com', 'amazon' is the subdomain of 'domain com', & 'www' is a label to create a subdomain of 'amazon.com'. This tree of labels may consist of 127 labels, & each label may contain 1 to 63 octets. The empty label is reserved for root node. The full domain name may not exceed a total length of 253 ASCII characters. A hostname is a domain name that has at least one associated IP address. The domain names 'www.amazon.com' & 'amazon.com' are valid hostnames, whereas, 'com' is not a hostname. Hostnames add restrictions on the characters allowed in the corresponding domain name. A valid hostname can be a valid domain name, but the vice versa is not true.
The right to use a domain name is delegated by domain name registrars, who are accredited to the ICANN. Further, each top level domain is maintained and serviced by an administrative organization operating a registry. This registry is responsible for maintaining the database of names registered with the top level domain it administers. The registry receives the registration information from each domain name registrar authorized to assign names in the corresponding top level domain, & publishes the information using whois protocol. Whois is a query and response protocol used for querying databases that stores the registered users or assignees of an internet resource, such as domain name.
Domain names are the foundations on which websites are built, & the qualitative domain names carry significant value, because of their online brand potential, advertising revenues, & search engine optimization.
The business of resale of registered domain names is known as domain aftermarket. Numerous factors decide the resale value of a registered domain name.
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| Domain Hierarchy |
Below the top level domains in the domain name hierarchy, are the second level domain names. These are the names directly to the left of top level domains. Next are the third level domain names, immediately to the left of second level domain names. There can be fourth & fifth level domain names, and so on, virtually with no limitations. The hierarchy of domains descend from right to left label in the name. Each label to the left specifies a subdomain of the domain to the right. In the complete domain name 'www.amazon.com', 'amazon' is the subdomain of 'domain com', & 'www' is a label to create a subdomain of 'amazon.com'. This tree of labels may consist of 127 labels, & each label may contain 1 to 63 octets. The empty label is reserved for root node. The full domain name may not exceed a total length of 253 ASCII characters. A hostname is a domain name that has at least one associated IP address. The domain names 'www.amazon.com' & 'amazon.com' are valid hostnames, whereas, 'com' is not a hostname. Hostnames add restrictions on the characters allowed in the corresponding domain name. A valid hostname can be a valid domain name, but the vice versa is not true.
The right to use a domain name is delegated by domain name registrars, who are accredited to the ICANN. Further, each top level domain is maintained and serviced by an administrative organization operating a registry. This registry is responsible for maintaining the database of names registered with the top level domain it administers. The registry receives the registration information from each domain name registrar authorized to assign names in the corresponding top level domain, & publishes the information using whois protocol. Whois is a query and response protocol used for querying databases that stores the registered users or assignees of an internet resource, such as domain name.
Domain names are the foundations on which websites are built, & the qualitative domain names carry significant value, because of their online brand potential, advertising revenues, & search engine optimization.
The business of resale of registered domain names is known as domain aftermarket. Numerous factors decide the resale value of a registered domain name.
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