what's a valid domain name?

pyh at mail.nsbeta.info pyh at mail.nsbeta.info
Sun Jan 30 01:40:51 UTC 2011

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? 


yes 163.com is a domain name but "163" also can be treated as a label for 
domain "com.", is it? 



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