HTML and CSS Reference
In-Depth Information
Figure 1.8
URL using FTP
Domain Names
A domain name locates an organization or other entity on the Internet. The purpose of
the Domain Name System (DNS) is to divide the Internet into logical groups and under-
standable names by identifying the exact address and type of the organization. The
DNS associates the text-based domain names with the unique numeric IP address
assigned to a device.
Let's consider the domain name The .com is the top-level domain
name. The portion is the domain name that is registered to Yahoo! and is
considered a second-level domain name. The www is the name of the Web server
(sometimes called Web host server ) at the domain. Taken all together, is considered to be a Fully-Qualified Domain Name (FQDN) .
Top-Level Domain Names (TLDs). A top-level domain (TLD) identifies the right-
most part of the domain name. A TLD is either a generic top-level domain, such as com
for commercial, or a country code top-level domain, such as fr for France. ICANN
administers the generic top-level domains shown in Table 1.1.
Table 1.1 Top-level domains
Generic TLD
Used By
Air-transport industry
Pan-Asia and Asia Pacific community
Catalan linguistic and cultural community
Commercial entities
Restricted to accredited degree-granting institutions of higher education
Restricted to government use
Unrestricted use
International organization (rarely used)
Human resource management community
Restricted to military use
Corresponds to a .com Web siteā€”the .mobi site is designed for easy access by mobile devices
Entities associated with network support of the Internet, usually Internet service providers or
telecommunication companies
Nonprofit entities
Accountants, physicians, and lawyers
Contact information for individuals and businesses
Travel industry
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