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  2. DomainKeys Identified Mail - Wikipedia

    en.wikipedia.org/wiki/DomainKeys_Identified_Mail

    An Agent or User Identifier (AUID) can optionally be included. The format is an email address with an optional local-part. The domain must be equal to, or a subdomain of, the signing domain. The semantics of the AUID are intentionally left undefined, and may be used by the signing domain to establish a more fine-grained sphere of responsibility.

  3. List of Internet top-level domains - Wikipedia

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

    This list of Internet top-level domains (TLD) contains top-level domains, which are those domains in the DNS root zone of the Domain Name System of the Internet.A list of the top-level domains by the Internet Assigned Numbers Authority (IANA) is maintained at the Root Zone Database. [1]

  4. Subdomain - Wikipedia

    en.wikipedia.org/wiki/Subdomain

    According to RFC 1034, "a domain is a subdomain of another domain if it is contained within that domain". Based on that definition, a host cannot be a subdomain, only a domain can be a subdomain. A subdomain will also have a separate zone file with a SOA record (Start of Authority). Most domain registries only allocate a two-level domain name ...

  5. Country code top-level domain - Wikipedia

    en.wikipedia.org/wiki/Country_code_top-level_domain

    An internationalized country code top-level domain (IDN ccTLD) is a top-level domain with a specially encoded domain name that is displayed in an end user application, such as a web browser, in its native language script or a non-alphabetic writing system, such as Latin script (.us, .uk and .br), Indic script (. भारत) and Korean script (.

  6. Join - Wikipedia

    en.wikipedia.org/wiki/Join

    Join (relational algebra), a binary operation on tuples corresponding to the relation join of SQL Join (SQL), relational join, a binary operation on SQL and relational database tables; join (Unix), a Unix command similar to relational join; Join-calculus, a process calculus developed at INRIA for the design of distributed programming languages

  7. 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 ...

  8. Data domain - Wikipedia

    en.wikipedia.org/wiki/Data_Domain

    In data management and database analysis, a data domain is the collection of values that a data element may contain. The rule for determining the domain boundary may be as simple as a data type with an enumerated list of values. [1] For example, a database table that has information about people, with one record per person, might have a ...

  9. .test - Wikipedia

    en.wikipedia.org/wiki/.test

    .test is a reserved top-level domain used to test websites or web applications as an alternative to testing webpages using the default localhost.It is guaranteed to never be registered into the Internet.