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The most basic functionality 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), domain names are restricted to the ASCII letters a through z (case-insensitive), the digits 0 through 9, and the hyphen, with some other restrictions in terms of name length and position of hyphens. Since this 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 Name Subcategories Domain Name Articles How To Make Money Online Parking Domain Names by Melvin Richardson Oct 16, 2008 Sedo is one the more popular marketplaces for selling and purchasing domain names as well as websites. One of the great features of Sedo is they allow you to park domain names. So let me explain what this process is all about. All you have to do is r... You Need To Know About Domain Names by Surinder Singh Sep 02, 2008 Many people settle with just one domain name, without realizing that your domain is one of the few things that your competitors can't copy from you. This is why I always recommend to buy multiple domain names, so that they are no longer available on ... You Need To Know About Domain Names by Satinder Kaur Sep 02, 2008 Many people settle with just one domain name, without realizing that your domain is one of the few things that your competitors can't copy from you. This is why I always recommend to buy multiple domain names, so that they are no longer available on ... New Online Advertising Vehicle for Connecting People and Businesses by nikola anastasov Jan 15, 2008 VirtuaDOM presents the perfect new and free online advertising vehicle for connecting people and businesses. VirtuaDOM Networking Sidebar is an extension for your web browser that provides the ability to surf, watch TV, advertise and talk simultaneou... Getting Your Name Out On The Internet by Peg Holland Dec 11, 2007 If you are in a start up business or are trying to establish your personal name then it is incumbent that you strategically get your name out on the internet as many times as possible so that the search engines, when looking for you, will ... Bought a Domain Name but never got around to using it? Put it to work! by Anthony Fallon Aug 21, 2006 Copyright 2006 Warrington Web Works RSS and other syndication technology has brought some wonderful distribution developments for online publishers so much so that software developers are now buying into the content distribution revolution by p... How Everyone Benefits From Submitting Articles For Publication by Emily Clark Jul 11, 2006 Who are the three groups of people that benefit from publishing articles and how do they all benefit from this activity? Firstly there is the author of the article, then the article directory where it is published and finally the visitors to the dire... How To Promote Your Site By Publishing Your Articles To Specialized Directories by Emily Clark Jul 11, 2006 Having the best looking site offering outstanding value products is worthless if your potential customers don’t get to see it. I know I am stating the obvious, but this critical fact is often overlooked. Promoting Your Site To Potential Custo...