.COM
This extension is the most widely used generic top-level domain on the Internet’s Domain Name System, with over 75 million dot com (Commerce) domains registered. One of the original top-level domains, it was first established in January of 1985. The United States Department of Defense was the original administrator, and for many years the responsibility of administering the .com domain changed hands under the flag of the government. In 1995 registration fees began and its current operation is under VeriSign. .COM Domains were originally intended for commercial purposes, but no restrictions exist on who can register a .com, and it can be used for any purpose. On March 15, 1985 symbolics.com was the first .com registered. NYNEXST was the one hundredth .com registered on November 30, 1987.
.NET
The third most used gTLD (Generic Top Level Domain) on the Internet today (.com and .de
.ORG
Originally intended for organizations that didn’t meet the requirements of the other TLD’s, .org (Organization) was created for the Domain Name System in January of 1985. Anyone can register an .org with no restrictions, although .org domains have come to represent non-profit organizations. A commercial enterprise could theoretically be launched under this tld, but better options, like .com and .net exist. Since the beginning of 2003 operation of .org has been run by Public Interest Registry. Some of the world’s political and diplomatic organizations use this tld. In July of 1985 mitre.org was the first .org domain registered.
.EDU
Established in January of 1985 as one of the seven original tld’s, .edu (Education) was established to be used by the world’s educational institutes. This tld is restricted in its use, only after proving your institute or organization’s accreditation to Educause, the non-profit that operates the closed .edu system, can you use this tld. This tld is overseen by the U.S. Department of Commerce. The following six-.edu tld’s were the first edu’s registered on April 24, 1985: Columbia.edu, Berkeley.edu, CMU.edu, Purdue.edu, Rice.edu, UCLA.edu.
.GOV
Used by the United States Federal Government, .gov (Government) tld was registered in January of 1985 to be used specifically by U.S. Government agencies. All governments in the U.S., both state and local, can apply to use the .gov tld at dotgov.gov. To register a .gov domain, a letter of authorization must be submitted to the General Services Administration, the registrar of this domain, and the reqirements must be met.
.MIL
One of the original seven tld’s, this top level domain was registered in January of 1985, and .mil (Military) was designed to be used by The United States Department of Defense and all its susidiaries. The registration and operation of this domain falls to the Defense Information Systems Agency, a organization with many fuctions, under the banner of the Department of Defense.
.INT
The seventh original gTLD established January 1985, .int (International) tld operates for internatonal peace keeping operations, and United Nation based entities, on the Domain Name System. The .int tld is operated by Internet Assigned Numbers Authority (IANA), a division of ICANN.