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2. List of Internet top-level domains - Wikipedia

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

   Seven generic top-level domains were created early in the development of the Internet, and predate the creation of ICANN in 1998. Name: DNS names; Entity: intended use; Administrator: managers; Notes: general remarks; IDN: support for internationalized domain names (IDN) DNSSEC: presence of DS records for Domain Name System Security Extensions

3. Alternative DNS root - Wikipedia

   en.wikipedia.org/wiki/Alternative_DNS_root

   The DNS root zone consists of pointers to the authoritative domain name servers for all top-level domains (TLDs). The root zone is hosted on a collection of root servers operated by several organizations around the world that all use a specific, approved list of domains that is managed by ICANN.

4. 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 (.

5. Generic top-level domain - Wikipedia

   en.wikipedia.org/wiki/Generic_top-level_domain

   Generic top-level domains (gTLDs) are one of the categories of top-level domains (TLDs) maintained by the Internet Assigned Numbers Authority (IANA) for use in the Domain Name System of the Internet. A top-level domain is the last level of every fully qualified domain name. They are called generic for historical reasons; initially, they were ...

6. Extension Mechanisms for DNS - Wikipedia

   en.wikipedia.org/wiki/Extension_mechanisms_for_DNS

   Extension Mechanisms for DNS (EDNS) is a specification for expanding the size of several parameters of the Domain Name System (DNS) protocol which had size restrictions that the Internet engineering community deemed too limited for increasing functionality of the protocol.

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.