What is TLD, Top-Level Domain?
TLD is the acronym for “Top Level Domain” and is placed in the dns root zone of an IP address (after the first dot) and may sometimes be described as the domain suffix or domain extension in the domain’s name space.
Top-Level Domain is often mislabled “top domain level”
Popular examples of Top Level Domains (TLDs) or top domain level are .com TLD, .edu TLD, and .net TLD, and as different Top-Level Domain extensions were created to help determine the type of organization, association or activity it applied to RFC 1591, the TLD nomenclature was designed to match and serve the domain names’ particular purpose or function.
Most of this does not hold true anymore and lines between uses of a Top-Level Domain has become muddied. For instance, the .org TLD was originally established to represent an organization as non-profit. The .com TLD was originally reserved for American commercial business use, but it too has not been enforced and is open to registrants to all countries, organizations and individuals.
Even .gov TLD reserved for the U.S Government has become bastardized in a way, as it is often used toward political ends, propaganda, and not, pure governmental information. But that’s for a different (another) day.
- See the comprehensive List of Internet Top-Level Domains below, or visit http://www.iana.org/domains/root/db/ for the current TLD list, or, to list TLD availability.
Now, all Top-Level Domain names or top domain level names (last time I’ll Use it) are unique and must have the required TLD extension.
Each human friendly Internet Domain Name is a particular sequence of alpha-numeric’s that provides a unique word, phrase, number, acronym, or alpha-numeric phrase. Never to be duplicated. For instance, ( http://DineHalfOff.com ) are three words uniquely tied together with a .com TLD.
A three letter acronym TLD would be IBM.com (International Business Machines.) Using this format, people can find the respective information (perhaps intuitively) on the Internet, and others can name their domain as unique as they like (first come, first served (except for trademark issues, see below)).

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