Top-level Domain


Definition of Top-level Domain in the Network Encyclopedia.

What is Top-level domain?

A Top-level domain is any domain that is directly under the root domain in the hierarchical Domain Name System (DNS). Top-level domains are few in number and are used to identify broad classes of Internet services. Except for country domains, the various top-level domains currently in existence are listed in the following table. A number of additional top-level domains are yet to be finalized and implemented.

Top Level Domains
Top Level Domains

Top-Level Domains

DomainDescription
.comCommercial businesses and personal domains
.eduMostly U.S. universities and colleges
.orgNonprofit organizations
.netNetworking and telecommunications companies
.govAmerican government branches and agencies
.milU.S. military

In addition to the domains listed in the table, countries as well as states and provinces within countries are identified by two-letter country codes. For example, .uk is the top-level domain for the United Kingdom, .ca is the top-level domain for Canada, and mb.ca is the top-level domain for the province of Manitoba in Canada. Although the .com domain is by far the most popular one today due to the way it is marketed, many businesses are forced to use other domains such as .net or their country domain because of the shortage of commercial top-level domains.

NOTE

A special domain called in-addr.arpa is used for reverse DNS name lookups (resolving a host name given the host’s IP address).

See also:

Editor

Articles posted after being checked by editors.

Recent Content

link to Public Key Infrastructure (PKI)

Public Key Infrastructure (PKI)

Public Key Infrastructure, also known as PKI, is a set of services that support the use of public-key cryptography in a corporate or public setting. A public key infrastructure (PKI) enables key pairs to be generated, securely stored, and securely transmitted to users so that users can send encrypted transmissions and digital signatures over distrusted public networks such as the Internet.
link to Digital Signature

Digital Signature

Digital Signature is an electronic signature that you can use to sign a document being transmitted by electronic means such as e-mail. Digital signatures validate the identity of the sender and ensure that the document they are attached to has not been altered by unauthorized parties during the transmission.