what's a valid domain name?
jw354 at cornell.edu
Fri Feb 4 16:26:08 UTC 2011
So 10.14.22.11 is a legal hostname, right?
We had a recent experience where our DNS administration
system allowed someone to insert in a CNAME record that
www.example.com. CNAME 10.14.22.11.
A fascinating thing about this is that my computer/browser could
take me to www.example.com just fine.
On Jan 30, 2011, at 7:30 AM, pyh at mail.nsbeta.info wrote:
> From RFC 1123
> One aspect of host name syntax is hereby changed: the
> restriction on the first character is relaxed to allow either a
> letter or a digit. Host software MUST support this more
> pyh at mail.nsbeta.info writes:
>> 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
>>> 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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