what's a valid domain name?

Chris Buxton chris.p.buxton at gmail.com
Sun Jan 30 18:09:40 UTC 2011

Correct, the requirement to start with a letter was removed ages ago.
Witness 3com.com, which may have been the first.

Chris Buxton
BlueCat Networks

On 1/29/11, pyh at mail.nsbeta.info <pyh at mail.nsbeta.info> wrote:
> 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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