IDN.IDN is an abbreviation for an Internationalized domain name whose Top level domain (TLD) is also internationalized, which could be transliterated .com, .net, .org, etc. or be groupings relevant to the language at hand.
As this is an issue still being "decided upon," (for many years, apparently) there are many factors to be considered. Here are a few just thrown out to be edited around and made to look pretty.
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A top-level domain (TLD) is one of the domains at the highest level in the hierarchical Domain Name System of the Internet. The top-level domain names are installed in the root zone of the name space. For all domains in lower levels, it is the last part of the domain name, that is, the last label of a fully qualified domain name. For example, in the domain name www.example.com, the top-level domain is com. Responsibility for management of most top-level domains is delegated to specific organizations by the Internet Corporation for Assigned Names and Numbers (ICANN), which operates the Internet Assigned Numbers Authority (IANA), and is in charge of maintaining the DNS root zone.
The domain name org is a generic top-level domain (gTLD) of the Domain Name System (DNS) used in the Internet. The name is truncated from organization. It was one of the original domains established in 1985, and has been operated by the Public Interest Registry since 2003. The domain was originally intended for non-profit entities, but this restriction was removed in August 2019. The domain is commonly used by schools, open-source projects, and communities, but also by some for-profit entities. The number of registered domains in org has increased from fewer than one million in the 1990s, to ten million in 2012, and held steady between ten and eleven million since then.
An internationalized domain name (IDN) is an Internet domain name that contains at least one label that is displayed in software applications, in whole or in part, in a language-specific script or alphabet, such as Arabic, Chinese, Cyrillic, Devanagari, Hebrew or the Latin alphabet-based characters with diacritics or ligatures, such as French. These writing systems are encoded by computers in multibyte Unicode. Internationalized domain names are stored in the Domain Name System (DNS) as ASCII strings using Punycode transcription.
The domain name net is a generic top-level domain (gTLD) used in the Domain Name System of the Internet. The name is derived from the word network, indicating it was originally intended for organizations involved in networking technologies, such as Internet service providers and other infrastructure companies. However, restrictions were never enforced and the domain is now a general-purpose namespace. It is still popular with network operators and the advertising sector, and it is often treated as an alternative to com.
.nu is the Internet country code top-level domain (ccTLD) assigned to the island state of Niue. It was one of the first ccTLDs to be marketed to the Internet at large as an alternative to the gTLDs .com, .net, and .org. Playing on the phonetic similarity between nu and new in English, and the fact that nu means "now" in several European languages, it was promoted as a new TLD with an abundance of good domain names available. The .nu domain is now controlled by the Internet Foundation in Sweden amid opposition from the government of Niue.
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.
.sa is the Latin alphabet Internet country code top-level domain (ccTLD) of Saudi Arabia. Domains of this type can be registered through SaudiNIC, a department of the Communications and Information Technology Commission. The Arabic alphabet ccTLD of Saudi Arabia is السعودية.
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 historic reasons; initially, they were contrasted with country-specific TLDs in RFC 920.
.ir is the Internet country code top-level domain (ccTLD) for Iran. It is managed by the Institute for Research in Fundamental Sciences.
.kr is the Internet country code top-level domain (ccTLD) for the Republic of Korea. Registrations are processed via registration agents.
The internationalized domain name (IDN) homograph attack is a way a malicious party may deceive computer users about what remote system they are communicating with, by exploiting the fact that many different characters look alike. For example, a regular user of example.com may be lured to click a link where the Latin character "a" is replaced with the Cyrillic character "а".
Single-letter second-level domains are domain names in which the second-level domain 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 domain names in the top-level domains com, net, and org, and grandfathered those that had already been assigned. In December 2005, ICANN considered auctioning these domains.
The top-level domain asia is the officially designated regional domain in the Internet for Asia and the Pacific. It is a sponsored generic top-level-domain (gTLD) operated by the DotAsia Organisation Ltd. The domain is open to companies, individuals and organisations that have a connection to the region. Asia domains can be seen and used by international and Asian businesses; regional conferences and symposiums; as well as Asian artists and celebrities.
The Domain Name System of the Internet consists of a set of top-level domains which constitute the root domain of the hierarchical name space and database. In the growth of the Internet, it became desirable to expand the initial set of six generic top-level domains in 1984. As a result, new top-level domain names have been proposed for implementation by ICANN. Such proposals included a variety of models ranging from adoption of policies for unrestricted gTLDs that could be registered by anyone for any purpose, to chartered gTLDs for specialized uses by specialized organizations. In October 2000, ICANN published a list of proposals for top-level domain strings it had received.
The domain name .рф is the Cyrillic country code top-level domain for the Russian Federation, in the Domain Name System of the Internet. In the Domain Name System it has the ASCII DNS name xn--p1ai. The domain accepts only Cyrillic subdomain applications, and is the first Cyrillic implementation of the Internationalizing Domain Names in Applications (IDNA) system. The domain became operational on 13 May 2010. As of 2014 it is the most used internationalized country code top-level domain, with around 900,000 domain names.
The domain name .укр is an approved internationalized country code top-level domain for Ukraine. It is a common abbreviation used in Ukraine, as in Ukrbank and Ukrnafta.
The Arabic name امارات, romanized as emarat, is the internationalized country code top-level domain for the United Arab Emirates. The ASCII name of this domain in the Domain Name System of the Internet is xn--mgbaam7a8h, using the Internationalizing Domain Names in Applications (IDNA) procedure in the translation of the Unicode representation of the script version. The domain was installed in the Domain Name System on 5 May 2010.
The Arabic domain name مصر is the internationalized country code top-level domain in the Domain Name System (DNS) of the Internet for Egypt. Its ASCII DNS name is xn--wgbh1c, obtained by the Internationalizing Domain Names in Applications (IDNA) transcription method.
An internationalized country code top-level domain is a top-level domain in the Domain Name System (DNS) of the Internet. IDN ccTLDs are specially encoded domain names that are displayed in an end user application, such as a web browser, in their language-native script or alphabet, such as the Arabic alphabet, or a non-alphabetic writing system, such as Chinese characters. IDN ccTLDs are an application of the internationalized domain name system to top-level Internet domains assigned to countries, or independent geographic regions.
.срб is the Internationalised (Cyrillic) Internet country code top-level domain for Serbia. It has been active since May 3, 2011.