DNS hosting service

A DNS hosting service is a service that runs Domain Name System servers. Most, but not all, domain name registrars include DNS hosting service with registration. Free DNS hosting services also exist. Almost all DNS hosting services are "shared"; except for the most popular Internet sites, there is no need to dedicate a server to hosting DNS for a single website. Many third-party DNS hosting services provide Dynamic DNS.

DNS hosting service is better when the provider has multiple servers in various geographic locations that minimize latency for clients around the world.

DNS can also be self-hosted by running DNS software on generic Internet hosting services.

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Dynamic DNS and NAT

There has been tremendous growth in the use of Network Address Translation (NAT) functionality. These devices include Windows machines running Internet Connection Sharing, included in Windows 98SE/Me/2000/XP, or other similar software such as Sygate Home Network. NAT software is also included in most open-source operating systems such as Linux (IP masquerading) or FreeBSD (natd), and is available for other platforms, such as Vicomsoft's Internet Gateway for Macs. More recently, we have seen hardware devices, often referred to as "routers", implementing NAT functionality, such as the Linksys routers, the Netgear Internet Gateway Routers, or the Nexland ISB line.

Many users of various NAT implementations then wonder if it is still possible to use dynamic DNS technology, as implemented in our Dynamic DNS and Custom DNS services, when using NAT. By itself, NAT does not affect dynamic DNS that much, but it does have significant impact on the operation of servers, which is the primary motive for the use of dynamic DNS technology. This white paper will discuss these issues and, whenever possible, make recommendations as to how they can be dealt with. Please note that we do not endorse or provide support for any third-party products that may be mentioned in this article. Also, please note that our discussion of NAT will be limited to the type of NAT where one or more private IPs are converted to one public IP: there are other types of NAT out there, but they are not commonly used in the residential, home office, or small business market.

There are two main challenges involved with using NAT and operating servers with the help of dynamic DNS: ensuring that traffic actually makes it through the NAT and then ensuring that the dynamic DNS hostname/domain is properly updated.

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The Structure of a Domain Name

A domain name always has two or more parts separated by dots and typically consists of some form of an organization's name and a three letter or more suffix. For example, the domain name for IBM is "ibm.com"; the United Nations is "un.org."

The domain name suffix is known as a generic top-level domain (gTLD) and it describes the type of organization. However in the last few years, the lines have blurred somewhat between these categories. Currently in use of these gTLDs:
aero--For the air-transport industry

.biz--Reserved for businesses

.com--For businesses, commercial enterprises, or online services like America Online. Most companies use this extension.

.coop--Reserved for cooperatives

.edu--For educational institutions and universities

.gov--Reserved for United States government agencies

.info--For all uses

.int--For organizations established by international treaties

.mil--For the United States military

.museum--For use by museums

.name--For use by individuals

.net--For networks; usually reserved for organizations such as Internet service providers

.org--For non-commercial organizations

.pro--For use by professionals, such as attorneys and physicians

ICANN, the Internet Corporation for Assigned Names and Numbers, manages the Domain Name System. For the latest news, visit the ICANN website. The more popular TLDs (.com, .net, .org, .biz, .info, .name) are available to the general public for registration of domain names.

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