A top-level domain (TLD) is one of the domains at the highest level in the hierarchical Domain Name System of the Internet after the root domain. The top-level domain names are installed in the root zone of the name space. For all domains in lower levels, it is the last part of the domain name, that is, the last non empty label of a fully qualified domain name. For example, in the domain name www.example.com, the top-level domain is com. Responsibility for management of most top-level domains is delegated to specific organizations by the ICANN, an Internet multi-stakeholder community, which operates the Internet Assigned Numbers Authority (IANA), and is in charge of maintaining the DNS root zone.
.cd is the Internet country code top-level domain (ccTLD) for the Democratic Republic of the Congo. It was created in 1997 as a replacement for the .zr (Zaire) ccTLD, which was phased out and eventually deleted in 2001.
.uk is the Internet country code top-level domain (ccTLD) for the United Kingdom. It was first registered in July 1985, seven months after the original generic top-level domains such as .com and the first country code after .us.
A country code top-level domain (ccTLD) is an Internet top-level domain generally used or reserved for a country, sovereign state, or dependent territory identified with a country code. All ASCII ccTLD identifiers are two letters long, and all two-letter top-level domains are ccTLDs.
.an was the Internet country code top-level domain (ccTLD) for the former Netherlands Antilles. It was administered by the University of the Netherlands Antilles. The domain was phased out after the Netherlands Antilles were dissolved in 2010. As of November 2010 the .an domain remained live with over 800 domains registered under .an, including secondary levels. On 31 July 2015, use of the domain was discontinued.
.bb is the Internet country code top-level domain (ccTLD) for Barbados.
.bd is the Internet country code top-level domain (ccTLD) for Bangladesh. It is administered by the Ministry of Posts, Telecommunications and Information Technology. Registrations are at the third level beneath several second-level labels, paralleling the oldest gTLDs; registration is open except in the gov and mil subdomains, which are limited to authorized entities in the Bangladesh government. There is online registration facility available for .bd domains right now.
.bi is the Internet country code top-level domain (ccTLD) for Burundi. It is administered by the Burundi National Center of Information Technology.
Western Sahara is a disputed territory, and as such it has no country code top-level domain (ccTLD). .eh is reserved for this purpose, and will be assigned if the Western Sahara conflict results in an agreement between Morocco and armies in the territory. IANA has not designated a ccTLD manager for the .eh domain.
.tl is the current country code top-level domain (ccTLD) for East Timor (Timor-Leste). It is administered through the Council of Country Code Administrators (CoCCA) and second-level registration is available through resellers worldwide with no local presence requirement.
.il is the Internet country code top-level domain (ccTLD) of Israel. It is administered by the Israel Internet Association and managed by NIC - ISRAEL, which hosts the DNS root server and manages the Israeli Internet Exchange, that supports IPv4 and IPv6.
.cv is the country code top-level domain (ccTLD) for Cape Verde. It is managed by the National Communications Agency. It was introduced on 21 October 1996 and initially it was managed by the Instituto Superior de Engenharia e Ciências do Mar (ISECMAR), later the School of Maritime Sciences, and finally a campus of the University of Cape Verde, until its redelegation in August 2009 by the current National Communications Agency.
.vg is the Internet country code top-level domain (ccTLD) for the British Virgin Islands. Because it allows registration at the second level, and does not require the registrant to be associated with the British Virgin Islands, it has also been used by piracy related websites such as The Pirate Bay, and video gaming related blogs and websites.
.uz is the Internet country code top-level domain (ccTLD) for Uzbekistan. Registry services were formerly operated by Euracom GmBH, but were later redelegated to UZINFOCOM. Registrations are taken directly at the second level, but the former registry also advertised the availability of registrations at the third level beneath co.uz and com.uz, and some domain names under other second-level names such as org.uz also exist.
.gf is the country code top-level domain (ccTLD) for French Guiana. It is delegated to the ISP Canal+ Telecom.
.ky is the Internet country code top-level domain (ccTLD) for the Cayman Islands. The code was chosen as other possible options had already been allocated. Registration was limited to residents and registered companies in the Cayman Islands with a local address, but this restriction was removed in September 2015. The Cayman Islands also has the international three-letter code CYM and has won a bid to be awarded the .cym domain in a future expansion of the top-level domain space.
.ma is the Internet country code top-level domain (ccTLD) for Morocco. A local registrar with a local Moroccan company as administrative contact is needed to register a .ma or .co.ma domain name. Further restrictions are imposed on the registering of other second-level domains.
.na is the Internet country code top-level domain (ccTLD) for Namibia corresponding to the two letter code from the ISO-3166 standard.
.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.
An internationalized country code top-level domain is a top-level domain in the Domain Name System (DNS) of the Internet. IDN ccTLDs are specially encoded domain names that are displayed in an end user application, such as a web browser, in their language-native script or alphabet, such as the Arabic alphabet, or a non-alphabetic writing system, such as Chinese characters. IDN ccTLDs are an application of the internationalized domain name system to top-level Internet domains assigned to countries, or independent geographic regions.
Guinea-Bissau 
