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 for top-level domain
From The Free On-line Dictionary of Computing (30 December 2018) :

  top-level domain
      The last and most significant component of an
     Internet fully qualified domain name, the part after the
     last ".".  For example, host wombat.doc.ic.ac.uk is in
     top-level domain "uk" (for United Kingdom).
     Every other country has its own top-level domain, including
     ".us" for the U.S.A.  Within the .us domain, there are
     subdomains for the fifty states, each generally with a name
     identical to the state's postal abbreviation.  These are
     rarely used however.  Within the .uk domain, there is a .ac.uk
     subdomain for academic sites and a .co.uk domain for
     commercial ones.  Other top-level domains may be divided up in
     similar ways.
     In the US and some other countries, the following top-level
     domains are used much more widely than the country code:
     	.com - commercial bodies
     	.edu - educational institutions
     	.gov - U. S. government
     	.mil - U. S. armed services
     	.net - network operators
     	.org - other organisations
     Since the rapid commercialisation of the Internet in the 1990s
     the ".com" domain has become particularly heavily populated
     with every company trying to register its company name as a
     subdomain of .com, e.g. "netscape.com" so as to make it easy
     for customers to guess or remember the URL of the comany's
     home page.
     United Nations entities use the domain names of the countries
     where they are located.  The UN headquarters facility in New
     York City, for example, is un.org.
     Several new top-level domains are about to be added (Oct
     	.nom   - individual people
     	.rec   - recreational organisations
     	.firm  - businesses such as law, accounting, engineering
     	.store - commercial retail companies
     	.ent   - entertainment facilities and organisations

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