what's a valid domain name?
pyh at mail.nsbeta.info
pyh at mail.nsbeta.info
Sat Jan 29 05:30:51 UTC 2011
Barry Margolin writes:
> In article <mailman.1559.1296265826.555.bind-users at lists.isc.org>,
> pyh at mail.nsbeta.info wrote:
>
>> I googled and found this:
>
> It's on the Internet, so it must be true. :)
>
>>
>> * A domain name can be up to 63 characters long plus a dot plus the
>> characters used to identify the top-level domain (i.e "com", "info", "biz",
>> etc.
>> * Valid characters in a domain name include letters, numbers and
>> hyphens "-". The domain name must start and end with a letter or number.
>>
>>
>> So, for this domain name of
>> "www.xyxyxyxyxyxyxyxyxyxyxyxyxyxyxyxyxyxyxyxyxyxyxyxyxyxyxyxyxyxyxyxy.com"
>> whose size is larger than 64, is not a valid domain name?
>>
>> And is there a RFC item for a valid domain name?
>
> RFC 1035 section 3.1 says: "To simplify implementations, the total
> length of a domain name (i.e., label octets and label length octets) is
> restricted to 255 octets or less."
>
> The length of each label within a domain name is limited to 63
> characters.
>
Thanks for the kind info.
Regards.
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