Thursday, 17 March 2011
Logo Design
Monday, 14 March 2011
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Monday, 7 March 2011
The domain name space consists of a tree of domain names.
The domain name space consists of 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 root zone.
[edit] Domain name syntax
A domain name consists of one or more parts, technically called labels, that are conventionally concatenated, and delimited by dots, such as example.com.
* The right-most label conveys the top-level domain; for example, the domain name www.example.com belongs to the top-level domain com.
* The hierarchy of domains descends from the right to the left label in the name; each label to the left specifies a subdivision, or subdomain of the domain to the right. For example: the label example specifies a node example.com as a subdomain of the com domain, and www is a label to create www.example.com, a subdomain of example.com. This tree of labels may consist of 127 levels. Each label may contain 1 up to and including 63 octets. The empty label is reserved for the root node. The full domain name may not exceed a total length of 253 characters.[2] In practice, some domain registries may have shorter limits.
* A hostname is a domain name that has at least one associated IP address. For example, the domain names www.example.com and example.com are also hostnames, whereas the com domain is not. However, other top-level domains, particularly country code top-level domains, may indeed have an IP address, and if so, they are also hostnames.
* Hostnames impose restrictions on which characters may be used in the domain name. A valid hostname is also a valid domain name, but a valid domain name is not necessarily valid as a hostname.
Web Hosting
[edit] Domain name syntax
A domain name consists of one or more parts, technically called labels, that are conventionally concatenated, and delimited by dots, such as example.com.
* The right-most label conveys the top-level domain; for example, the domain name www.example.com belongs to the top-level domain com.
* The hierarchy of domains descends from the right to the left label in the name; each label to the left specifies a subdivision, or subdomain of the domain to the right. For example: the label example specifies a node example.com as a subdomain of the com domain, and www is a label to create www.example.com, a subdomain of example.com. This tree of labels may consist of 127 levels. Each label may contain 1 up to and including 63 octets. The empty label is reserved for the root node. The full domain name may not exceed a total length of 253 characters.[2] In practice, some domain registries may have shorter limits.
* A hostname is a domain name that has at least one associated IP address. For example, the domain names www.example.com and example.com are also hostnames, whereas the com domain is not. However, other top-level domains, particularly country code top-level domains, may indeed have an IP address, and if so, they are also hostnames.
* Hostnames impose restrictions on which characters may be used in the domain name. A valid hostname is also a valid domain name, but a valid domain name is not necessarily valid as a hostname.
Web Hosting
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