what's a valid domain name?
Barry Margolin
barmar at alum.mit.edu
Sat Jan 29 04:20:15 UTC 2011
In article <mailman.1559.1296265826.555.bind-users at lists.isc.org>,
pyh at mail.nsbeta.info wrote:
> I googled and found this:
It's on the Internet, so it must be true. :)
>
> * 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?
RFC 1035 section 3.1 says: "To simplify implementations, the total
length of a domain name (i.e., label octets and label length octets) is
restricted to 255 octets or less."
The length of each label within a domain name is limited to 63
characters.
--
Barry Margolin, barmar at alum.mit.edu
Arlington, MA
*** PLEASE don't copy me on replies, I'll read them in the group ***
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