Domain Name Services
The main purpose of a domain name is to provide symbolic representations, i.e., recognizable names, to mostly numerically addressed Internet resources. This abstraction allows any resource (e.g., website) to be moved to a different physical location in the address topology of the network, globally or locally in an intranet, in effect changing the IP address. This translation from domain names to IP addresses (and vice versa) is accomplished with the global facilities of Domain Name System (DNS).
By allowing the use of unique alphabetical addresses instead of numeric ones, domain names allow Internet users to more easily find and communicate with web sites and any other IP-based communications services. The flexibility of the domain name system allows multiple IP addresses to be assigned to a single domain name, or multiple domain names to be services from a single IP address. This means that one server may have multiple roles (such as hosting multiple independent websites), or that one role can be spread among many servers. One IP address can also be assigned to several servers, as used in anycast networking.
By definition (RFC 1034, updated by RFC 1123), domain names are made of non-empty labels separated by dots (.); labels are restricted to the ASCII letters a through z (case-insensitive), the digits 0 through 9, and the hyphen (-), with restrictions in terms of name length and position of hyphens. Namely hyphen cannot appear at the beginning or at the end of a label, and the length of a label should be between 1 to 63 with total length of a domain name not exceeding 255 (a restriction of the Domain Name System, see RFC 2181, section 11). Since this definition does not allow the use of many characters commonly found in non-English languages, and no multi-byte characters necessary for most Asian languages, the Internationalized domain name (IDN) system has been developed and is now in testing stage with a set of top-level domains established for this purpose.
The underscore character is frequently used to ensure that a domain name is not recognized as a hostname, as with the use of SRV records, for example, although some older systems such as NetBIOS did allow it. To avoid confusion and for other reasons, domain names with underscores in them are sometimes used where hostnames are required.
Domain names are often referred to simply as domains and domain name registrants are frequently referred to as domain owners, although domain name registration with a registrar does not confer any legal ownership of the name, only an exclusive right of use.
The following example illustrates the difference between a URL (Uniform Resource Locator) and a domain name:
As a general rule, the IP address and the server name are interchangeable. For most Internet services, the server will not have any way to know which was used. However, the explosion of interest in the Web means that there are far more Web sites than servers. To accommodate this, the hypertext transfer protocol (HTTP) specifies that the client tells the server which name is being used. This way, one server with one IP address can provide different sites for different domain names. This feature goes under the name virtual hosting and is commonly used by web hosts.
For example, as referenced in RFC 2606 (Reserved Top Level DNS Names), the server at IP address 220.127.116.11 handles all of the following sites:
When a request is made, the data corresponding to the hostname requested is provided to the user.
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By registering an Internet domain name for your organization you make sure that you uniquely identify your company in the vast environment of the Internet i.e. an internet address www.yourcompany.com, and an email address such as email@example.com
This makes your company's Internet presence more easily locatable on the Internet and projects an image of a progressive organization, which has introduced the Internet as a medium of conducting business. As a local Internet registry, Logosnet Technologies, provides full domain name registration and IP allocation services under:
In a addition we can provide pre- registration services for the following new domain extensions and reserve for you any domain you wish to have when these domain are officially used!
[ Domain Name Administration and Forwarding ]
Once you have your organization's domain name registered you need to host it with an ISP in order for it to be accessible from the Internet. This service is called Domain name administration and it implies that your service provider will be filtering all internet traffic passing through its internet network and will be diverting everything that comes through with your domain name to the appropriate location, whether this is your local email, web or e-commerce site, or even your ISP-hosted web site or email box.
[ IP Address Allocation ]
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The Barracuda Spam Firewall is compatible with all email servers and can fit into nearly any corporate or small business environment. It is used by small organizations with as few as 10 employees and large organizations with as many as 200,000 employees. A single Barracuda Spam Firewall handles up to 100,000 active email users. Multiple units can be clustered together for even greater capacity and high availability.
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