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2. .local - Wikipedia

   en.wikipedia.org/wiki/.local

   This name is usually configured with the first-level domain of .local. At the present time, the .local domain name is not registered on the Internet. However, more recent articles have cautioned or advised against such use of the .local TLD. Support article 300684 [6] listed contoso.local as an example of a "best-practice Active Directory ...

3. .localhost - Wikipedia

   en.wikipedia.org/wiki/.localhost

   The name localhost is a commonly defined hostname for the loopback interface in most TCP/IP systems, resolving to the IP addresses 127.0.0.1 in IPv4 and ::1 for IPv6.As a top-level domain, the name has traditionally been defined statically in host DNS implementations with address records (A and AAAA) pointing to the same loopback addresses.

4. 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 ...

5. Fully qualified domain name - Wikipedia

   en.wikipedia.org/wiki/Fully_qualified_domain_name

   Dot-separated fully qualified domain names are the primarily used form for human-readable representations of a domain name. Dot-separated domain names are not used in the internal representation of labels in a DNS message [7] but are used to reference domains in some TXT records and can appear in resolver configurations, system hosts files, and URLs.

6. .example - Wikipedia

   en.wikipedia.org/wiki/.example

   In 1999, the Internet Engineering Task Force reserved the DNS labels example, invalid, localhost, and test so that they may not be installed into the root zone of the Domain Name System. [1] The reason for reservation of these top-level domain names is to reduce the likelihood of conflict and confusion.

7. 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) and the associated errata.