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2. example.com - Wikipedia

   en.wikipedia.org/wiki/Example.com

   The domain names example.com, example.net, example.org, and example.edu are second-level domain names in the Domain Name System of the Internet.They are reserved by the Internet Assigned Numbers Authority (IANA) at the direction of the Internet Engineering Task Force (IETF) as special-use domain names for documentation purposes.

3. .pro - Wikipedia

   en.wikipedia.org/wiki/.pro

   The domain name pro is a generic top-level domain in the Domain Name System of the Internet. Its name is derived from professional , indicating its intended use by certified professionals. History

4. Email address - Wikipedia

   en.wikipedia.org/wiki/Email_address

   The format of an email address is local-part@domain, where the local-part may be up to 64 octets long and the domain may have a maximum of 255 octets. [5] The formal definitions are in RFC 5322 (sections 3.2.3 and 3.4.1) and RFC 5321—with a more readable form given in the informational RFC 3696 (written by J. Klensin, the author of RFC 5321 [6]) and the associated errata.

5. Second-level domain - Wikipedia

   en.wikipedia.org/wiki/Second-level_domain

   In the Domain Name System (DNS) hierarchy, a second-level domain (SLD or 2LD) is a domain that is directly below a top-level domain (TLD). For example, in example.com, example is the second-level domain of the .com TLD. Second-level domains commonly refer to the organization that registered the domain name with a domain name registrar.

6. List of Internet top-level domains - Wikipedia

   en.wikipedia.org/wiki/List_of_Internet_top-level...

   The second-level domain name must be the thing to be created immediately when a user visits the .new website. Most likely, the .new will redirect to a company's main website. Charleston Road Registry Inc. (Google) [n 2] Un­known: Yes .news: News organizations, educational publications, trade publications, neighborhood news blogs — Un­known ...

7. Single-letter second-level domain - Wikipedia

   en.wikipedia.org/wiki/Single-letter_second-level...

   Single-letter second-level domains are domains in which the second-level domain of the domain name consists of only one letter, such as x.com.In 1993, the Internet Assigned Numbers Authority (IANA) explicitly reserved all single-letter and single-digit second-level domains under the top-level domains com, net, and org, and grandfathered those that had already been assigned.