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The domain name рф (romanized as ''rf'' 〔(Rossia.rf becomes first Cyrillic domain ), RIA Novosti, 25/11/2009〕) 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 . 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.〔(World report on Internationalised Domain Names 2014 ) page 94〕 ==Character set== ''рф'' ((ロシア語:Российская Федерация)) is transliterated as ''Rossiyskaya Federatsiya'', the Russian Federation. The domain has an ASCII representation of xn--p1ai derived as Punycode for use in the Domain Name System.The domain is intended for Internet resources with names in the Russian language using Cyrillic.〔 (Кириллический домен ".рф" появится в Сети в 2008 году ) (''Cyrillic domain ".рф" will be introduced in 2008''), ''RBC Informations Systems'', 25 December 2007; accessed 24 September 2008.〕 A principle in the approval process of ICANN Generic Names Supporting Organization (GNSO) states that Cyrillic two-character top-level domains should not exclusively use characters that could be confused with Latin characters of identical or similar shapes—not just those containing the seven letters а, е, о, р, с, у, and х, but also proposed ccTLDs such as .бг (Bulgaria) due to its visual similarity to .br.〔(General remarks on Cyrillic IDNs ), ''ICANN Generic Names Supporting Organization wiki'', (revision dated 22 June 2008 ); accessed 24 September 2008.〕 As such, GNSO sought to avoid the direct transcription of "ru" into Cyrillic, "ру", and common abbreviations for ''Russia'' ((ロシア語:Россия)), such as "ро", in order to avoid confusion with the Latin ccTLDs .py (Paraguay) and .po ( unassigned). In English sources .рф can be romanized as .rf, but the latter is not a valid domain for Russia. More recently, four other countries have won approval of three-letter Cyrillic ccTLDs such as .укр, .срб, .мон and .қаз. As of today .рф remains the only Cyrillic ccTLD with two letters. 抄文引用元・出典: フリー百科事典『 ウィキペディア（Wikipedia）』 ■ウィキペディアで「.рф」の詳細全文を読む スポンサード リンク
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