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. In December 2005, ICANN considered auctioning these domain names. 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 six single-letter domains in existence at that time under .com, .net and .org were the following: The .org TLD was subsequently reopened for single-letter domain registrations. These and selected other gTLD and ccTLD single-letter domain names currently in use, typically as shortcuts, are listed below. 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 .bo .by .bz .cm .cn .co .cr .cx .cz .de .dk .fm .gd .gg .gl .gp .gs .gt .gy .hn .hr .ht .ie<ref>One and Two Letter .IE Domains Now Available "The release of short .ie domain names " Dublin, 12 October 2015</ref> .im .io .is .je .kg .ki .kw .la .lb .lc .ly .md .mg .mk .mp .ms .mw .mx .mu .nf .np .nz .pe .ph .pk .pl .pn .pr .pw .ro .sh .st .tc .tl .tt .to .tv .ua .vc .vg .vn .vu .ws Non-ASCII single-character domains Single-character non-ASCII second-level domains also exist (as seen below), also known as Internationalized domain names (IDN), these domains are actually registered as their Punycode translations (which are more than a single character) for DNS purposes. ICANN oversees a process for determining registration rules that involves wide-ranging stakeholder input and assorted Working Groups. In the case of .com domains, decisions are then implemented by Verisign, the contracted backend operator for the .com registry. The result is a list of 96,957 codepoints allowed for IDN registrations. As mentioned above, some additional domains previously-registered are "grandfathered" and remain active. Many gTLDs also allow IDN registration. These 96,957 distinct IDN characters eligible for registration in .com are the essential building-blocks of languages worldwide. A single letter domain does not provide the context found in a longer string