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what is a list of all the characters that can appear on a domain name

Posted on 2015-01-12
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I recently learned a domain name can contain ü which is u with two dots above u
what is a list of all the characters that can appear on a domain name
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Question by:rgb192
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doug s earned 250 total points
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by:Deadman
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The only valid characters for a domain name are letters(abc), numbers(123) and a hyphen (-). Other special characters like the underscore (_) or an exclamation mark (!) are NOT permitted. A domain name can be up to 64 characters long -- including the 4 characters used to identify the Top Level Domain (.net, .com, .org or .edu).

check the list
http://www.eurid.eu/en/get-eu/why-eu-good-business/domain-names-special-characters-idns/supported-characters
http://en.wikipedia.org/wiki/.ar
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by:rgb192
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more characters than I thought. Thanks
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