Whilst the are many very long domain names, there are very few short domain names.

One letter global .com domain names are a rarity. In fact, there are only 3 and these are

Q.com

X.com

Z.com

These one-letter domain names were registered before the naming authorities introduced rules.

There are a total of only 736 (26 x 26) alpha 2-letter .com domain names, or 1188 (36 x 36) alpha-numeric 2-letter .com domain names if you include the 10 numerics 0 - 9 to the 26 letters of the alphabet a - z.

With newer suffices such as .biz, .info, .us etc then it is not possible to register 2 letter domain names.

see How many characters can I have in a .biz name? as well as other .biz domain restrictions
also How many characters can I have in a .info name? as well as other .info domain restrictions

With country codes the situation is generally similar. With UK domains 2 alphabetic only domains are not permissible. For example AZ.co.uk is not allowable see UK Domain Naming Rules . However, 2 letter alpha-numeric domain names are allowable, where one character is alpha and the other is numeric i.e. Z9.co.uk

Despite the current Nominet naming rules not permitting the registration of 2 alpha character Uk domain names, there are some that were registered before the current rules were introduced. These include :

BT.co.uk

IT.co.uk

For some example of very long domain names see Pneumonoultramicroscopicsilicovolcanokoniosis

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