utf 8 - Utf-8 in subdomain? -

Is it possible to use UTF-8 in subdomain? If so, which characters are allowed and how does the can-mix-encoding work?

I have tried RTFM, but Google too much

about subdomain There is not a lot in particular, given the name of the given domain name foo.example.com label ( foo , example , < Code> com ). So you might want to know if you can use UTF-8 in the given label.

The low level answer is that the label is defined as:

     Which means that you can only find in the  [- a-zA-Z0- 9]  one label.  
 Hyacer is used to encode unicode characters, in short, they are encoded in other characters' labels:  "xn--" + pincode (label) .  
 For the ranges, at least:  
  The IDN label for the character (U + 002E, U + 3002, U + FF0E, U + FF61) can not be in the .








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