Domain Name Rules for Top Level Domain Names
Domain names have a variety of basic rules. For example, with a .com, .net, .org domain name:
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Use only letters, numbers, or dash ("-")
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Cannot begin or end with a dash
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Cannot have more than 67 characters (including .com, .net, and .org)
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Country code domain names cannot exceed 26 characters total
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Domain names are not case sensitive
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Domain names cannot include spaces
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.COM - to be used for commercial and personal sites
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.ORG - recommended for not-for-profit organizations
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.NET - recommended for companies involved in Internet infrastructure
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Must have at least 3 characters, but less than 63*, not including .COM, .NET and .ORG *
.com, .net and .org domain names exceeding a total of 26 characters are supported by most web browsers. However, certain web browsers, email programs and other Internet related applications may not support domain names over 26 characters.