Top-level domainA 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. .uk.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. it is the fifth most popular top-level domain worldwide (after .com, .cn, .de and .net), with over 10 million registrations. uk has used OpenDNSSEC since March 2010. Internet in the United Kingdom#History and Nominet UK#History In October 1984, RFC 920 set out the creation of ccTLDs using country codes derived from the corresponding two-letter code in the ISO 3166-1 list.
ICANNThe Internet Corporation for Assigned Names and Numbers (ICANN ˈaɪkæn ) is an American multistakeholder group and nonprofit organization responsible for coordinating the maintenance and procedures of several databases related to the namespaces and numerical spaces of the Internet, ensuring the network's stable and secure operation. ICANN performs the actual technical maintenance work of the Central Internet Address pools and DNS root zone registries pursuant to the Internet Assigned Numbers Authority (IANA) function contract.
.asiaThe top-level domain .asia is the officially designated regional domain in the Internet for Asia and the Pacific. It is a sponsored generic top-level-domain (gTLD) operated by the DotAsia Organisation Ltd. The domain is open to companies, individuals and organisations that have a connection to the region. Asia domains can be seen and used by international and Asian businesses; regional conferences and symposiums; as well as Asian artists and celebrities.
.us.us is the Internet country code top-level domain (ccTLD) for the United States. It was established in early 1985. Registrants of .us domains must be U.S. citizens, residents, or organizations – or foreign entities with a presence in the United States or any territory of the United States. Most registrants in the U.S. have registered for .com, .net, .org and other gTLDs, instead of .us, which has primarily been used by state and local governments, even though private entities may also register .us domains.
