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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. ==Active single-letter domains== On December 1, 1993, the Internet Assigned Numbers Authority (IANA) explicitly reserved the remaining single-letter and single-digit domain names. The few domains that were already assigned were grandfathered in and continued to exist. The assigned domains in this group are the following: Some other single-letter domain names are also in use. Many other single-letter second-level domains have been registered under country code top-level domains. The list of Country code top-level domains which have been identified to allow single-letter domains are : .ac .af .ag .ai .am .asia .biz .bo .by .bz .cm .cn .co .com.ar .com.br .co.at .co.il .co.uk .cr .cz .cx .dj .de .dk .fm .gd .gg .gl .gp .gs .gt .gy .hn .ht .im .io .je .kg .ki .kw .la .lb .lc .ly .md .mg .mk .mp .ms .mw .mx .mu .nf .nz .pe .ph .pk .pl .pn .pw .ro .sh .st .tc .tl .tt .to .tv .travel .ua .ws .vc .vg .vn and .vu.〔Hofman Laursen, Christopher (), ''(The World's Shortest Domain Names: How To Get a One Character Domain )'', Copenhagen, 01 December 2014. Retrieved on 04 December 2014.〕 Single-character non-ASCII second-level domains also exist (e.g. (☺.com )), but these are actually registered as their Punycode translations (which are more than a single character) for DNS purposes. 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「Single-letter second-level domain」の詳細全文を読む スポンサード リンク
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