A TLD (top-level domain) is the highest level of domain names in the root zone of the DNS of the Internet. For all domains in lower levels, it is the last part of the domain name, that is, the label that follows the last dot of a fully qualified domain name. In other words the last part of an Internet domain name that follow the final dot of a fully qualified domain name. For example, in the domain name www.dnsknowledge.com, the top-level domain is com.
Internet Corporation for Assigned Names and Numbers (ICANN) looks after most top-level domain. It operates the Internet Assigned Numbers Authority (IANA) and is responsible for maintaining the DNS root zone. DNS server which keeps all root zone is called TLD name server.
Generic top-level domains
There are different types of TLD name server. Initially this group consisted of GOV, EDU, COM, MIL, ORG, and NET.
|aero||the air transport industry.|
|arpa||reserved exclusively to support operationally-critical infrastructural identifier spaces as advised by the Internet Architecture Board|
|asia||companies. organisations and individuals in the Asia-Pacific region|
|com||commercial organizations, but unrestricted|
|edu||post-secondary educational establishments|
|gov||government entities within the United States at the federal, state, and local levels|
|info||informational sites, but unrestricted|
|int||international organizations established by treaty|
|mil||the U.S. military|
|mobi||sites catering to mobile devices|
|name||families and individuals|
|net||originally for network infrastructures, now unrestricted|
|org||originally for organizations not clearly falling within the other gTLDs, now unrestricted|
|tel||services involving connections between the telephone network and the Internet (added March 2, 2007)|
|travel||travel agents, airlines, hoteliers, tourism bureaus, etc.|