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com
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Managed by
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int/net/org
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DNS and Internet
The Internet Domain Name System is managed by a Name Registration Authority
on the Internet, responsible for maintaining top-level domains that are assigned by
organization and by country. These domain names follow the International Standard
3166. Existing abbreviations, reserved for use by organizations, as well as two-
letter and three-letter abbreviations used for countries, are shown in the following
table.
DNS Domain Name Type of Organization
com Commercial organizations
edu Educational institutions
org Non-profit organizations
net Networks (the backbone of the Internet)
gov Non-military government organizations
DNS Domain Name Type of Organization
mil Military government organizations
num Phone numbers
arpa Reverse DNS
xx Two-letter country code
Resource Records
A DNS database consists of resource records (RRs). Each RR identifies a particular
resource within the database. There are various types of RRs in DNS.
The following table provides detailed information on structure of common RRs
(Note: this is not an exhaustive list of RRs).
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