I googled and found this:
* 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?
Regards.
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