Concept

Top-level domain

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.invalid

The name invalid is reserved by the Internet Engineering Task Force (IETF) in RFC 2606 (June 1999) as a domain name that may not be installed as a top-level domain in the Domain Name System (DNS) of the Internet. In 1999, the Internet Engineering Task Force reserved the DNS labels , , , and so that they may not be installed into the root zone of the Domain Name System. The reasons for reservation of these top-level domain names is to reduce the likelihood of conflict and confusion.

.coop

.coop is a sponsored top-level domain (sTLD) in the Domain Name System of the Internet. It is intended for the use of cooperatives, their wholly owned subsidiaries, and other organizations that exist to promote or support cooperatives. The TLD was proposed by the National Cooperative Business Association (NCBA) as a response to the announcement by the Internet Corporation for Assigned Names and Numbers (ICANN) in late 2000 of a phased release of seven new generic top-level domains in an expansion of the Internet domain name space.

.name

The domain name is a generic top-level domain (gTLD) in the Domain Name System of the Internet. It is intended for use by individuals for representation of their personal name, nicknames, screen names, pseudonyms, or other types of identification labels. The top-level domain was founded by Hakon Haugnes and Geir Rasmussen and initially delegated to Global Name Registry in 2001, and become fully operational in January 2002. Verisign was the outsourced operator for .name since the .

Localhost

In computer networking, localhost is a hostname that refers to the current computer used to access it. It is used to access the network services that are running on the host via the loopback network interface. Using the loopback interface bypasses any local network interface hardware. The local loopback mechanism may be used to run a network service on a host without requiring a physical network interface, or without making the service accessible from the networks the computer may be connected to.

.rs

rs is the Internet country code top-level domain (ccTLD) for Serbia. The domain name registry that operates it is the Serbian National Internet Domain Registry (RNIDS). The letters rs stand for Republika Srbija/Република Србија (Republic of Serbia). It is intended to be used with few restrictions, and it is widely used in Serbia. Because of English words ending with the letters "rs", this domain is also used in the construction of domain hacks, and websites related to the Rust programming language, in which source code files typically end in .

.ac

The .ac top-level domain is the Internet country code (ccTLD) for Saint Helena, Ascension and Tristan da Cunha, used primarily for Ascension Island (Saint Helena has its own ccTLD, .sh). It is administered by NIC.AC, a subsidiary of the Internet Computer Bureau based in the United Kingdom. Registration for the domain is open to anyone. The registry accepts registrations of internationalized domain names. The domain is marketed by some domain-brokers as a domain for the city of Aachen, Germany, after the automotive license plate designation ("AC") for the city.

.yu

.yu was the Internet country code top-level domain (ccTLD) that was assigned to SFR Yugoslavia in 1989 and was mainly used by Serbia and Montenegro and its two successor states. After Montenegro and Serbia acquired separate .me and .rs domains in 2007, a transition period started, and the .yu domain finally expired in 2010. The .yu ccTLD was assigned originally to the Socialist Federal Republic of Yugoslavia, during the government project for the development of scientific-technological information (SNTIJ).

.mil

The domain name mil is the sponsored top-level domain (sTLD) in the Domain Name System of the Internet for the United States Department of Defense and its subsidiary or affiliated organizations. The name is derived from military. It was one of the first top-level domains, created in January 1985. The United States is the only country that has a top-level domain for its military, a legacy of the United States' military's role in the creation of the Internet. Other countries often use second-level domains for this purpose, e.

.travel

.travel is a top-level domain in the Domain Name System of the Internet. .travel domain names are available to individuals and / or organizations who provides or plans to provide services, products or content in or to the travel industry. It is sponsored by Donuts Inc., and registrations are processed via accredited registrars. The domain was approved by ICANN on April 8, 2005 as a sponsored TLD in the second group of new TLD applications evaluated in 2004. TheGlobe.com acquired Tralliance Corporation, the operator of .

.mk

mk is the Internet country code top-level domain (ccTLD) for Republic of North Macedonia. It is administered by the Macedonian Academic Research Network (MARnet). Anyone can register a .mk domain. Registration is possible directly at the second level without any restrictions. Registrations under a number of second level domains are also possible, however those use of those domains are restricted to certain entities. The Internationalized Cyrillic country code top-level domain .