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2. Email address - Wikipedia

   en.wikipedia.org/wiki/Email_address

   An email address consists of two parts, a local-part (sometimes a user name, but not always) and a domain; if the domain is a domain name rather than an IP address then the SMTP client uses the domain name to look up the mail exchange IP address.

3. Domain name - Wikipedia

   en.wikipedia.org/wiki/Domain_name

   An annotated example of a domain name. In the Internet, a domain name is a string that identifies a realm of administrative autonomy, authority or control. Domain names are often used to identify services provided through the Internet, such as websites, email services and more. Domain names are used in various networking contexts and for ...

4. Country code top-level domain - Wikipedia

   en.wikipedia.org/wiki/Country_code_top-level_domain

   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.

5. Email - Wikipedia

   en.wikipedia.org/wiki/Email

   The part before the @ sign is the local part of the address, often the username of the recipient, and the part after the @ sign is a domain name. The MSA resolves a domain name to determine the fully qualified domain name of the mail server in the Domain Name System (DNS).

6. .us - Wikipedia

   en.wikipedia.org/wiki/.us

   A large number of third-level domains are reserved for localities within states. Each fourth-level domain registration under this namespace follows the format organization-name.locality.state.us, where state is a state's two-letter postal abbreviation and locality is a hyphenated name that corresponds to a ZIP code or appears in a well-known atlas.

7. Domain registration - Wikipedia

   en.wikipedia.org/wiki/Domain_registration

   History. In 1993 the U.S. Department of Commerce, in conjunction with several public and private entities, created InterNIC to maintain a central database that contains all the registered domain names and the associated IP addresses in the U.S. (other countries maintain their own NICs (Network Information Centers) -- there is a link below that discusses Canada's system, for example).