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However, starting around 2001, the top-level domain space expanded quite a bit. A
sample of the top-level domains that have been added beyond the commonly known ones
is shown in Table D-2. Potentially more domains may be found at the Internet Assigned
Numbers Authority (IANA) Web site (iana.org).
At the time of this edition's writing in 2009, there is a distinct possibility that arbitrary
domains could be introduced. For example, .google might be top-level domain for all Google
properties. Even without this happening, the top-level domain space is clearly a mess, and
with generic domains on the horizon, the situation seems unlikely to get much better soon.
Geographic domains are particularly common outside the United States; such a domain
name typically contains more information than the organization type, with a fully qualified
domain name (FQDN) including a country code as well. It generally is written as follows:
machine name . domain name . domain type . country code
Zone identifiers outside the U.S. use a two-character code to indicate the country
hosting the server. These include . ca for Canada, . mx for Mexico, . jp for Japan, and so on. A
few examples are shown here.
A complete list of country codes can be found at the IANA site (iana.org).
Business entities similar to .com
Entities in the Asia Pacific region
Business entities (similar to .com)
Catalan linguistic and cultural community-related sites
Job hosting sites
Mobile device sites
Museums and similar institutions
Individual by names
Professionals, particularly certified accountants, engineers, lawyers, and physicians
Telephone and contact information
Travel and tourism-related sites
T ABLE D-2 Some Newer Top-Level Domains