<Li> testing top - level domains </Li> <Li> generic top - level domains (gTLD) </Li> <P> The initial set of generic top - level domains, defined by RFC 920 in October 1984, was a set of "general purpose domains": com, edu, gov, mil, org . The net domain was added with the first implementation of these domains . The com, net, and org TLDs, despite their originally - specific goals, are now open to use for any purpose . </P> <P> In November 1988, another TLD was introduced, int . This TLD was introduced in response to NATO's request for a domain name which adequately reflected its character as an international organization . It was also originally planned to be used for some Internet infrastructure databases, such as ip6.int, the IPv6 equivalent of in-addr.arpa . However, in May 2000, the Internet Architecture Board proposed to exclude infrastructure databases from the int domain . All new databases of this type would be created in arpa (a legacy domain from the conversion of ARPANET), and existing usage would move to arpa wherever feasible, which led to the use of ip6.arpa for IPv6 reverse lookups . </P>

.org .net .gov .com and .mil are examples of what