what's a valid domain name?
pyh at mail.nsbeta.info
pyh at mail.nsbeta.info
Sun Jan 30 12:30:08 UTC 2011
From RFC 1123
One aspect of host name syntax is hereby changed: the
restriction on the first character is relaxed to allow either a
letter or a digit. Host software MUST support this more liberal
syntax.
pyh at mail.nsbeta.info writes:
> Joseph S D Yao writes:
>
>>
>> The labels must follow the rules for ARPANET host names. They must
>> start with a letter, end with a letter or digit, and have as interior
>> characters only letters, digits, and hyphen. There are also some
>> restrictions on the length. Labels must be 63 characters or less.
>>
>
> A label must start with a letter? oh I don't think so.
> How about these domains which all have huge DNS traffic?
>
> 163.com
> 126.com
> 51.com
> 56.com
>
> yes 163.com is a domain name but "163" also can be treated as a label for
> domain "com.", is it?
>
> Thanks.
>
> Regards.
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