Top Level Domains

Top-level domains (TLDs) encompass the .com, .net, .org,, and other similar domains on the Internet. These top-level domains contain information about lower-level domains in the DNS address space. For example, is under the control of the .net namespace (not the Microsoft programming architecture!).

There are many top-level domains that divide up the domain namespace at its highest level. Table 21-1 lists some of the most common ones.

TABLE 21-1

Top-Level Domains

.com Commercial organizations


Network of machines


Non-profit organizations


U.S. military


U.S. government

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