WWW FAQs: How long can a domain name be?

2005-09-17: Theoretically, any one component of a domain name can be up to 256 characters long. Officially, many registries including the .com, .net and .org registries limit domain names to less than 63 characters. To be practical, however, domain names should be much shorter than this if users are ever expected to want to type them... or even discuss them in email. Many registrars will not sell domain names anywhere near that long.

For more information, see how do I register a domain name?

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